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How do I trap cats?

I want to get a job as a self-employed cat and dog trapper. Because basically I love animals and want to be around them. I can't by the way get my own cats and dogs because I live in a group home. But I would love to help others get a kitty or pup into their lives?

Topic by DGCInfoKitty    |  last reply

Intructables For 3D Printing

I know Instructables is a great community forum for finding learning new skills.Please i want to know more knowledge about 3D Printing, Electronics, Photography

Question by flashnewz247    |  last reply

"Upvote" button ??

I'm French and I don't understand the "Upvote" function.Does somebody could explain me ?

Question by TangLB    |  last reply

Need help with bonnet vent for my car Answered

Hi everyone. I have a car after modifications, which makes it awfully hot under the hood. I have to get rid of this temperature. I found videos on youTube where people made active vents. I think about something like that all the time. I would like to open and close them with a button. It could be based on an electric motor or vacuum. Could anyone make any technical or illustrative drawings, anything I could rely on during construction. Vent would be as tight as possible so that water does not get in. The whole would be based on the idea from this video

Question by Jakidaboy    |  last reply

Feature Request: @user tag

For me instructables is great because of it's outstanding community. Still, I believe this could be an even better place if we worked closer together.  Sure, this can't be forced, but it can be made easier: It would help greatly if a "@user" tag was introduced. It should do two things: Notify the user mentioned, both with an on-page notification (like a PM) as well as through email Produce a clickable link to the user's page The usage cases are plenty. It could be used if... an authors project is based on @user ideas/ project @user has improve upon one's work @user has similar project worth checking out a comment/ forum post is adressed to @user, even though it is not a direct response one knows @user is interested in a instructable/ forum post, but may have missed it Unlike PMs it's a quick and public method to reach out for people. I am very aware that even though this is a "small" idea it may take much effort to develop and integrate throughout the site. Yet I do believe it would be absolutely worth it, as it... motivates authors (it is the greatest feeling to know somebody values the project you've poured all of your heart into) keeps conversations going (I've seen many comments not being responded to just because they haven't used the reply button) brings people with similar ideas and interests together (isn't this what instructables is all about?) It could happen that this will be abused by some people, so "blocking" certain users (to not receive notifications) should be a mandatory function. What do you think about this?

Topic by nqtronix    |  last reply

Feeding baby praying mantis (newly hatched)

FYI to anyone who has or wants to know what you can feed praying mantis babies right after they hatch. The egg sack i have been "protecting" (i thought) til spring has just hatched a day ago and its only december, my plan was to let them go after they hatched in the spring, but since i didnt keep the sack cold, it hatched now. After i freaked out for abit seeing i have about 50 or more TINY mantis all over the container i put the sack in, i called and called ALL over but no one would take them, and i cant let them just die. Everything i read about them says they only eat LIVE bugs..and they have to be small...really really pinhead crickets or fruit flies...well...YUCK..i dont want that in the house...but if thats what they need then so be it..UNTIL...i called a bait store and the guy (i wanted to KISS him for this info) told me to put RAW MEAT on a string so it sticks in small peices and hang it in the container..IT WORKS!! they went right for it!! SOOOO.........if you dont want or cant get tiny live food for them...FEED THEM RAW HAMBURER MEAT on a string!! this picture is the mom, isnt she beautiful! haha..i mean it!

Topic by Chiana    |  last reply

Analysing your test results for Aspergers Syndrome

A free for all, discussion on self analysis of your test picture (a pie graph) or Aspie-Rating-Picture (ARP) and final score Please try not to post pictures here, leave that for Can somebody volunteer their non-Aspie picture, for the purposes of this discussion. Mine is here temporarily.

Topic by Lateral Thinker    |  last reply

How can I make a hollow, see-through sphere? Answered

This is for an adaptation of a lamp. What I want is to cover the bulb with a large (little smaller than a basketball) sphere, so there will be a hole in one end. Light obviously needs to be able to shine through. My first thought was a resin of some sort, and a quick search led me to epoxy resin. Is this see-through? Can colour be added? Any other ideas? Some early thoughts: - In an inflated balloon, inject liquid. Rotate, thereby distributing fairly evenly, until liquid hardens. Cons: How long do I have to rotate this balloon? What if it pops!? (Could use a hard container...) - Double boiler: Use two similar bowls, small inside larger, fill in between. Cons: How to get it even? Smaller bowl would float (weigh it down...) Not even close to a sphere With your suggestions I'll do a few trials, possibly put out an instructable if something works. All suggestions are welcome (even if they deviate a little). Thanks!

Question by funkrack    |  last reply

Online Game Recemendations

I have 2 games (and a half), first: this is an adventer MMORPG. You battle different types and levels of monsters and characters. You can strive to be the richest or to be the strongest. Second: this is a fan site with its own habbo like interface. You log in and you automaticly get 800,000 free coins. In you have to buy you're coins for 10 cents a coin. That can add up! 50 coins is $10, so I recomend what they call, a retro habbo. (I am sorry... this website had been moved to a different server or deleted. I am sad too) In a half: I dont recomend this game unless you have 500 dollars laying in a dust gathering pile in you're tool shed or you will have the least of fun!

Topic by ellomate56    |  last reply


Forum for games!

Topic by j1a1m1e1s    |  last reply

Must Be Nice Comments.

I've been trying to upload comments to a micro controller forum and it continuously tells me my post isn't nice enough or isn't formated correctly. This is getting vary annoying. This stupid policy of letting a poorly thought out filter program block comments that don't fit a "nice" format needs to go. This is the post I'm trying to make.I'm getting the following errors with the AtMega8. It must be a problem with the giveio driver which I have installed but it's still not working. All the forums say to just install it but that's not fixing the problem. I'd greatly appreciate any help."avrdude: can't open device "giveio"avrdude: failed to open parallel port "lpt1"make.exe: *** [program] Error 1> Process Exit Code: 2> Time Taken: 00:00""

Topic by enxion    |  last reply do I convert pressure to flow to determine ounces over time? Answered

How do I convert beer. How do I convert pressure to ounces. If I know my pressure at the valve is 20 psi with beer running through 3/16 inch tube how do I convert the flow to ounces say over 10 seconds when I open the valve? Would love some help. thanks

Question by Cosmoo    |  last reply

New Site Search Doesn't Work on Chrome on Mac

I'm running Chrome 27.0.1453.47 beta on a MacBook Pro running OS 10.8.3 and I can type in the new search box on the main homepage but it doesn't search when I hit return or when I click on the magnifying glass. It worked in Firefox though.  I've disabled adblock to see if that was the cause of the issue and that didn't help either.  Anyone else have this issue?  I've had a lot of issues with Chrome on the Mac with this site, including when editing instructables.  I couldn't even submit this bug report on Chrome because the "Preview Topic" button would not do anything when clicked.

Topic by johnfixesstuff    |  last reply

Making your own hand sanitizer if there is none left in the shops....

For some unknown reason around here all shops are out of hand sanitizer.My sister needed some as three kids just make it a requirement thanks to Corona.Had to be cheap and plentyful she said....Methylated spirit is still freely available in bulk at the hardware store, so I grabbed some.Had no Calcium Acetate at hand so I ordered 200g online, it E263 if I recall correctly, a food additive.To give it a nice smell I added some natural pappermint oil to the list.The making is dirt simple....For every 100ml of alcohol add about 20ml of filtered water - you don't want it full strenght.Give a few drops of your favourite scent to it.Then slowly add some Calcium Acetate and keep stirring.Once the mix reaches the desired consistency of a more or less runny gel you are set to go.How easy is that for a change?Oh, in a hurry and no Calcium Acetate available anywhere? No problem!Use egg shells and vinegar.About 70g in egg shells should do for a good amount of sanitizer.Use a large (high) pot and add about 400ml of vinegar to it.If you can get the cleaning strength then better.Add the crushed egg shells and keep stirring.It will foam up, so add them slowly!You need to keep stirring as the shells tend to float up with the produced CO2.If no shells dissolve anymore add some more vinegar.At the end you want to have some leftover shells but no more bubbling to indicate all the acetic acid from the vinegar was used up the reaction.Filter through a coffe filter, or several layers of it to get a clean solution.Bring it to a boil to get rid of the water.Once you get a paste in your pot turn the heat off and remove the stuff from your pot to air dry.If in a hurry, then spread it out on some baking paper and place at about 120°C in your oven to fully dry.Crush up in a bag once cool and you have the Calcium Acetate you need ;)

Topic by Downunder35m    |  last reply

Knex Bows(Not Crossbows)

I was looking for a design for a knex bow.(for a play at school)lol I made a rubber band bow, but I want to try to make a real string bow for school and battle bow for home. Any ideas?

Topic by Knexagon    |  last reply

What can I use to artistically burn wood, without a soldering iron? Answered

I need to write something in wood, but instead of writing, I want to actually burn it in. Buuut I lost my soldering iron, what could I use?

Question by Kryptonite    |  last reply

​How to add a loud speaker to (the most basic) landline phone?

Hello!How would you connect a loudspeaker to a basic landline phone (so several people can hear the conversation)? (Basic phones don't have loudspeakers, only the one handling the headset can hear). The loudspeaker doesn't have to be super loud, it could be like the ones powered by USB on computers, or much smaller, as far as we could hear the conversation. It's not that easy since theses phone are merely powered by the little current inside the landline phone line. So I guess I need another power source, like a USB charger, and maybe to amplify the sound signal, to use the loudspeaker. I started to learn electronics for a few months, but I have no idea how to handle this problem. Any advice would be great! Thanks for your help!

Topic by hobhob    |  last reply

Position sensitive device

Hi guys, I'm looking for a 2D position detecting device!! And I'm looking for a specific one, but unfortunately I don't know the exact name or working principle, but it was a long and thin bar, with a usb socket, probably connected to a computer and gives the readings (position) once any object crosses the cross-section area aligned with the bar. Can you also suggest any easy-to-use 2D optical position detection devices/ sensors!! Can you please advise!! Appreciate your cooperation!!

Question by aftbx9    |  last reply

Trying to fix fried remote control LED light

I'm wondering if it's possible to fix a dead LED remote control light. The LEDs themselves are still good and will come on when I put 3v directly to them. I think the problem is a part that looks obviously fried (S9017 burnt spot HF). I'm hoping to get some opinions from you guys on what exactly it's function was and how to replace it. Thanks!

Question by aliasjanedoe    |  last reply

Can someone help me figure out how to make Nerf hunting darts that will kill birds? Answered

I wanna kill feral birds but I'm only allowed a Nerf gun. Help me!

Question by TheNerdWhoBuilds    |  last reply

How do I make an attractive toilet paper shield to keep my 7 cats from shredding my TP?

Please don't tell me to "turn the roll around" or to lock the cats out of the bathroom. These are not feasible. The kitties shread the roll no matter position it is in, and we've got one litter box that MUST be in the bathroom. I have 7 cats, and they need a box in almost every room in the house. I've been keeping the current roll in the cabinet, but I'm getting pretty sick of having to hide the roll every time I go to the bathroom. There has to be a better way. I want ideas on how to make a simple, attractive, and durable cover for the toilet paper roll. I'm almost ready to go out and buy a commercial cover, but I think they are hideous -- great gargantuan hunks of plastic. Much thanks for ideas... Jamie, Boots, Mousie, Minnie, Domino, Beaners, Choppy, and Winston

Question by lotussutra    |  last reply

How to delete my own post. Answered

I accidentally double-posted in the comments section of an instructable. I'd like to delete one of them. How do I do that?

Question by fkeel    |  last reply

Can you use hydrogen gas for cooking

Can you use hydrogen gas for cooking ( Stoves ) What modifications would i need to do.? Conversion from Gas to Hydrogen

Question by HOWLER88    |  last reply

Help! My low voltage, outdoor lighting wont light up - transformer error codes?

I bought a Portfolio 300watt transformer for low voltage outdoor lighting and hooked up a 100' 12 gauge cable (outdoor rated lighting cable) to it. Then I hooked up 4 low voltage lights (12volt 20 watts each). I plugged the transformer in to a gfi outlet that I ran out from the house. And turned it on. The little display flashes "E" and then "1" . The instructions say that the E means that there is a fire hazard so check the circut. So I unhooked every light except one. Same error. I hooked on a different light and unhooked the first one. Same error. Instructions say the cable needs to be under 250'. And the load less than 300w. I am there, except it won't run. Do I have a bad transformer or is there something that I am missing? Oh, and this is to light my haunt in my front yard, so I am running out of time! Thanks for any advice! Matt

Topic by mckeephoto    |  last reply

How to thread an aluminium rod

Hi, I have got some 1 inch aluminium pipes (GI pipes) which I want to thread. I got the threading machine (hand held racheting type) and when I try to thread using that, it goes about 2 threads and after that, its pain - so stiff and even after exerting all my force, the pipe wont thread. I had read that to thread easier, you should coat the pipe with Wax or threading oil. Is there any other tips or tricks that you have used for threading? Any input is greatly appreciated. Regards, Sujith

Topic by slsujith    |  last reply

Capturing Audio using ESP32

I'm building a modest wall of lights with an ESP32 and dozens of ws2812b leds and thought wouldn't it be cool to set it up as spectrum analyser. I was thinking of having bluetooth speakers with an aux out, pair them to my phone and hook the aux out to the ESP32 to analyse the audio and drive the leds. Of course, it's not that straight forward so I thought I'd break it down into smaller tasks - First off hooking up the aux cable to the ESP32Amanda’s explanation of her op amp circuit proved very useful as a starter for 10 but I'll need to make some changes .First off, I need to lose the 9 volt batteries. To do this I believe I can replace the TL072 dual op amp she used with a TLV2372 dual rail to rail op amp. (Keeping it dual just in case I go stereo) The rail to rail feature allows me to use my currently available 5 volt supply rather than needing a higher voltage from the batteries Dan also pointed out in the comments, that the circuit is an inverted amplifier rather than a non-inverted amplifier. I checked out op amp circuits on Wikipedia And It turns out he was right – good catch Dan He’s obviously very smart so I also went along with his other suggestion of strapping the opposing input to ground with a 10k resistor to reduce noise For this project I don’t wish to use a mic and will be replacing it with an aux in jack so there is no need to give it any power. The amplitude of the voltage will be about half that of Amanda’s microphone but we have the variable pot to crank up the amplitude. Finally I’ll be replacing the Arduino with an ESP32 to perform the sampling/analysis of the signal. It’s faster and has bags of IOT features but I’m concerned I’ll need to make yet more changes. The Arduino ADC pin has a range from 0 – 5 volts whereas the ESP32 has a range of 0 - 3.3 volts. Thankfully we have the variable pot to adjust the amplitude to say 1.5volts . And for the voltage divider we can take advantage of the 3.3volts provided by the ESP32 dev board so there is in fact no need to adjust the resistors as the 100k/100k split gives us the desired 1.65 offset voltage. That turned out to be a lot easier than I expected So the circuit now looks like this Well done for reading down this far! Let me know if you see anything I may have missed or perhaps direct me to a similar project where I can pick up more tips Thanks

Question by CharlesGoodwin65  

Biobutanol in small batches

I am looking for information on making small batch production of butanol. I have a small remote oyster farm, and I am interested in incorporating kelp production into the farm. I have read a lot about using kelp to produce bioethanol, however, it blends so well with water, it would be problematic for an outboard engine. We are looking to make our operations carbon neutral. I have read a bit that suggests butanol would be a better alternative to ethanol, but haven't found nearly as much information on how it is developed. Would love some help or ideas

Question by brettonhills    |  last reply

My nerf guns.

Hey I was wondering what people thought about Nerf guns? I have these. Maverick. Nite Finder. Longshot. Magstrike. Vulcan. Firefly. The game. Longstrike. Deploy.

Topic by Vynash    |  last reply

Elevator call button any suggestion for a project? or ideas?

I have a and i was wondering what project i could do with it my 1st thought was a Light switch but it is a momentary contact so it would only turn my light on when I press it...

Question by 10mmrookie    |  last reply

Car Audio

Post all your stuff/questions about car audio.

Topic by RelyNupon    |  last reply

fast and easy way to get 3.3v from 5v without a lm317? Answered

I got a dvd player but the power supply was missing. i can get the 5v and the 12v, but other than a lm317 (which i dont have) i cant get 3.3v. ive looked at all sorts of things to try and find a 3.3v regulator, but everything i have searched up lead to several misleading results. so i was wondering, what value resistor could i use to get 3.3v from 5v or what devices could i look in to find a 3.3v regulator? i have several computer motherboards, a bunch of cd drives, a couple hard drives, etc. please help! thanks in advance,           zack247.

Question by zack247    |  last reply

5 pin strip to power source

Hi, I accidentally ordered a 5 pin LED strip and am having trouble finding a way to connect it to a power source. Is there an adapter?

Question by heather.walls    |  last reply

Minecraft Messed Up? Answered

I play minecraft for free at . I play on both creative mode and survival mode. On creative, I cannot spawn any of the monsters using the spawn eggs. (i.e. zombies, creepers, spiders, ect.) On survival mode, they do not show up at all! What should I do, if there is anything to do?

Question by freeza36    |  last reply

K'nex Combination Lock

I got bored and decided to show off my combination lock here at Ibles. It's not done yet, but here it is:;=SMOV0022.flv

Topic by Mepain    |  last reply

lifes unanswered questions...

Great questions to ponder over (great conversation starters!)Can you cry under water?why does a round pizza come in a square box?What's the difference between a novel and a book?How old are you before it can be said you died of old age?If nobody buys a ticket to a movie do they still show it?if a person owns a piece of land, do they own it to the center of the earth?if you have a cold hot pocket, is it just a pocket?Why doesn't glue stick to the inside of the bottle?Do penguins have knees?Why is it said that an alarm clock is going off when really its coming on?How come people tell you not to stand in front of an emergency exit when if there was an emergency surely you would run through it?Why did Sally sell seashells on the seashore when you can just pick them up anyway?Why are both of Spongebob's parents round like sea sponges while he is square like a kitchen sponge?(isn't this one great?)Does a two-humped camel store more fat than a one-humped camel?If you pamper a cow, do you get spoiled milk?Why is it that if someone yells "duck" they are helping you, but if they yell "chicken" they are insulting you?why do we drive on the parkway and park on the driveway?If the FBI breaks your door down do they have to pay for it?If they have angel food cake on earth, do they have people food cake in heaven?(don't start a war over that, its just a joke!)If you fart and burp at the same time, would it make a vacuum in your tummy?Why do you put two cents in when its only a penny for your thoughts?You know the signs on restaurant doors? No Shirt, No Shoes, No Service? what if someone goes in with No Pants? Would the restaurant still have to serve them?If a doctor suddenly died while doing surgery, would the other doctors work on the doctor or the patient?Why do we sing "Rock a bye baby" to lull our little ones to sleep when the song is about putting your baby in a tree and letting the wind crash the cradle to the ground?Why do we say we're head over heels when we're happy? Isn't that the way we normally are?If the Wicked Witch of the West melts in water... how did she ever bathe?If bald people work as chefs in a restaurant,do they have to wear hairnets?Why do sleeping pills have warning labels that state :'Caution: May Cause Drowsiness?How can Darth Vader breathe and talk at the same time?If there's a wheelchair-bound comedian, is it still called "stand-up"?When the French swear do they say pardon my English?Do people who use sign language see little hands in their head when they think about what somebody said, or do they hear the words in their head?How did Walt Disney figure out how to make people pay to stand in lines all day?Why do people constantly return to the refrigerator with hopes that something new to eat will have materialized?Why is it that no matter what color bubble bath you use the bubbles are always white?Why does someone believe you when you say there are four billion stars, but check when you say the paint is wet?Why do they call someone "late" if they died early?If the serving size on a can of soda is one can, then why is the serving size on the little can one can, too? Wouldn't the little cans be 2 cans?If a king is gay and marries another guy what is that guy to the royal family?Why are red buttons always the most important?How is chess considered a sport?Why is it when your sleeping it`s called drool but when your awake its called spit?If a teacher were to teach a younger grade than they were teaching before, would they be "degraded"?Why does every Abraham Lincoln impersonator sound the same, even though there are no known audio recordings of the man?How's come people tell you to stay a kid for as long as you can. Yet the moment you do anything childish or immature they tell you to grow up.Why does the Easter bunny carry eggs? Rabbits don't lay eggs.If marbles are not made of marble, why are they called marbles?If you dig a hole through the center of the earth, come out on the other side, and then let go, would you be falling down or floating up?Could you be a closet claustrophobic?Could someone be addicted to counseling? If so, how would you treat them?If ketchup is good on french fries, how come it isn't good on mashed potatoes?Where do all the daylight savings hours go?Why doesn't the hair on your arms grow as fast as the hair on your head?What happens if a black cat walks under a ladder and breaks a mirror?Why when people ask you "what three things would you bring with you on a desert island?" no one ever replies, "A BOAT"Why are elderly people often called "old people" but children are never called "new people"?Why doesn't broccoli come in a can?Can you slam a revolving door?What would happen if you found a four-leaf-clover under a ladder?Can a cross-eyed teacher control his pupils?If Winnie the pooh was civilized enough to keep his honey in jars, why did he eat it off his hands? Surely he had spoons?What happens if you get a paper cut from a Get Well card?Can you read a picture book?Why does it say "shake well" on ketchup bottles, but not ketchup packets?Is there ever a day that mattresses are not on sale?Is eating a mermaid considered cannibalism?If mirrors need light to work, what happens if you put night vision goggles on in the dark and look at a mirror?if you're on an American airline, and you land in Canada and stay on the plane, is the drinking age still 21 or does it change to 19?What happens if every team in the NFL goes 8-8?What shape is the sky?If a Jewish person goes to court and is asked to put their right hand on the Bible, do they use a Torah instead? (again, don't start a war over that)Why is it written "May contain traces of peanuts or other kind of nuts" on peanut butter jars. Are people stupid enough not to realize it themselves?If you only have one eye...are you blinking or winking?If you have a gun and you ask, "can I ask you a question?" and they say "fire away" should you shoot them?What is a chickpea if it is neither a chick nor a pea?Why is it called the People's Republic Of China when China's not a republic?Why are dandelions considered weeds when daisies are considered flowers?Why does Sea World have a seafood restaurant?Whenever an adult is kidnapped why isn't it called adultnapped?Why do black lights look purple?Did Yankee Doodle name the feather, hat, town, or his pony Macaroni?Why is it that people duck in the rain, do they really think the rain won't hit them?Why isn't the caps lock capitalized?If someone with a nostril ring takes it out, then blows their nose, do they have to cover that hole as well as their nostril holes so that snot doesn't blow out everywhere?Isn't it weird that if you rearrange the word "teacher" you get "cheater"?How come whenever you start to sing, you automatically sing in a higher voice than you talk?How come people say they ate the last piece of gum, when they really just chew it?You know the saying "throw ya hands in the air like ya don't care"? why bother doing that if you don't care?Why is there no pine or apple in pineapple?Why do water bottles have a "best if used by" date?\If you called the police station to talk to an officer and he was not there, would that be considered a cop out?Why do they put holes in crackers?How come on TV the bell always rings and then the kids go to class, but in real life you need to be in class before the bell rings?Why can the saying "it's all downhill from here." mean both that it will be easy and that it is going to get worse?If all of ACME's products backfire, why does Wile E. Coyote keep buying them?Why do "cool" and "hot" mean the same thing?If you sneeze and fart at the same time, does a vacuum form in your stomach?Why does triangularly cut bread taste better than square bread?Does a baby feel the umbilical cord being cut off?Is it legal to name your kid "Anonymous"?If you have a pet with 2 heads do you have to name both heads?Why can't liquor freeze?If you dig a hole in the south pole are you digging up or down?How come they don't add the time that we are in our mom's to our age?Why do people squint their eyes when they can't see? Wouldn't that just make it less space to see out of?What is a hacky, and why is it in a sack?Who was in the kitchen with Dina?Why do we have to pay a toll on "freeways"?Why do they call them pepperoni if there is no pepper in it?How old does something have to be to become an antique?Can a school teacher give a homeless child homework?Do babies produce more spit than adults?How come French fries are not considered a vegetable, they are just deep fried potatoes?Do cows have calf muscles?Why is shampoo clear but conditioner not?If conjoined twins participate in sports, do they count as one or two players?If a singer sings their own song during a karaoke party, is it considered karaoke?Why do mattresses have designs on them when they're always covered with sheets?If you died with braces on would they take them off?If a person suffered from amnesia and then was cured would they remember that they forgot?Can someone have their head in the clouds and be down-to-earth at the same time?Why is Joey short for Joe, when Joey has more letters?If you were a pastor, and you were getting married, would you hire a pastor, or would you do the wedding yourself?Is there a certain temperature at which it stops being qualified as cold? At what temperature does it qualify as hot?if someone tells you not to be your self, who should you be?Why is most lunchmeat bigger than the bread?Why is it that whenever you sing to the radio, your voice is higher? Even when you have a low voice?How come toy hippos are always blue, or purple, when real hippos are brown?Have ex-mathematicians become dysfunctional?Have ex-locomotive engineers been derailed?Have ex-civil lawyers been distorted?Have ex-bankers become disinterested?Are there seeing eye humans for blind dogs?You know that little indestructible black box that is used on planes, why can't they make the whole plane out of the same substance?After eating, do amphibians have to wait an hour before getting out of the water?Can fat people go skinny-dipping?You know how most packages say "Open here". What is the protocol if the package says, "Open somewhere else"?Would a fly without wings be called a walk?Why isn't there mouse-flavored cat food?Why isn't phonetic spelled the way it sounds?Why isn't "palindrome" spelled the same way backwards?Why is there an expiration date on SOUR cream?Why is the word "abbreviate" so long?do the ABC's and twinkle twinkle little star have the same tune?Why is the alphabet in that order? Is it because of that song?Why is Mickey Mouse bigger than his dog Pluto?why does Goofy live in a house and Pluto in and dog house if there both dogs?Why is it, whether you sit up or sit down, the result is the same?Why is it when two planes almost hit each other it is called a "near miss"?Why is it called 'after dark', when it is really after light?Why is it called a TV "set" when you only get one?why is a pair of underwear one item?Why is it called a "building" when it is already built?Why do we say something is out of whack? What is a whack?Why do women wear evening gowns to go out at night? Shouldn't they be wearing night gowns?Why is the man who invests all your money called a broker?Do Roman paramedics refer to IV's as "4's"?olive oil is made out of olives, and peanut oil is made out of peanuts. What is baby oil made out of?!If drinking and driving is illegal, why do bars have parking lots?If someone leads but no one follows... are they just out for a walk?After they make styrofoam, what do they ship it in?Are part-time band leaders semi-conductors?Before they invented drawing boards, what did they go back to?.............the list goes on and on, maybe i will make a sequel.i can not take credit for all of these, most of them were from this website

Topic by dsman195276    |  last reply

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I have just planted my flower garden with all sorts of seeds and bulbs. Unfortunately, my cats seem to think that I've dug up all of this nice dirt for them to use as a litter box. I've tried coffee grounds sprinkled on the area which I've heard are repulsive to cats and also fertilize the flowers, but my cats evidently were born at a Starbuck's. I now have sprinkled mothballs all over the flower bed but I'm afraid that they are going to burn my plants that are now coming up although they are keeping the cats out. Can anyone help me?

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Question by bigjohn412    |  last reply

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Question by PurpleShark    |  last reply

heliostat and sun tracker basic program

In the late 1980s, I designed, built and programmed a computer-controlled heliostat. Its mirror reflected sunlight into my living-room, making it much brighter. It worked excellently with almost no attention for many years, until a neighbour's tree grew and blocked sunlight from reaching the mirror. The computer was a Commodore VIC 20, which was old even then, and had only 4.5 kilobytes of memory. The program I wrote, in Commodore BASIC, fitted into that space and handled all the control functions. It even included a few "bells and whistles". For example, at night-time the mirror was automatically parked face downward to reduce the buildup of dust. That particular program would work only on a VIC, and I haven't seen any of those for many years. However, I have recently taken the astronomical and trigonometrical parts of the program and made them into a new program which I'll append below. It calculates the position of the sun in the sky, as azimuth (true compass bearing) and angle of elevation, as seen from anywhere on the earth at any time on any date. It also calculates the required orientation of a mirror if it is to reflect sunlight in any desired direction. With the addition of some code to enable the computer to control motors, this could become the software for a computerized sun-tracker or heliostat. I'll append two versions of the program. The first is in QBasic, and contains quite a lot of explanatory comments. The second version is in a very generic BASIC, and has been tested on many implementations of the language. It even has line numbers! Personally, I prefer the QBasic version. The coding is more elegant. However, the generic version is likely to be useful to more people. It's public-domain. Use it for any purpose, even commercially. Enjoy! dow ' SunAlign.BAS (Version for QBasic and similar dialects) ' Calculates position of sun in sky, as azimuth (compass bearing ' measured clockwise from True North) and angle of elevation, as ' seen from any place on earth, on any date and any time. ' Also calculates alignment of a heliostat mirror. ' David Williams ' P.O. Box 48512 ' 3605 Lakeshore Blvd. West ' Toronto, Ontario. M8W 4Y6 ' Canada ' Initially dated 2007 Jul 07 ' This version 2008 Jan 13 ' All angles in radians except in i/o routines DegIn and DegOut DECLARE SUB C2P (X, Y, Z, AZ, EL) DECLARE SUB P2C (AZ, EL, X, Y, Z) DECLARE FUNCTION Ang (X, Y) DECLARE SUB DegIn (P$, X) DECLARE SUB DegOut (P$, X) CONST PY = 3.1415926536# ' "PI" not assignable in some BASICs CONST DR = 180 / PY ' degree / radian factor W = 2 * PY / 365 ' earth's mean orbital angular speed in radians/day WR = PY / 12' earth's speed of rotation relative to sun (radians/hour) C = -23.45 / DR ' reverse angle of earth's axial tilt in radians ST = SIN(C) ' sine of reverse tilt CT = COS(C) ' cosine of reverse tilt E2 = 2 * .0167 ' twice earth's orbital eccentricity SN = 10 * W ' 10 days from December solstice to New Year (Jan 1) SP = 12 * W ' 12 days from December solstice to perihelion CLS Menu: PRINT "1. Calculate sun's position" PRINT "2. Calculate mirror orientation" PRINT "3. Calculate both" PRINT "4. Quit program" PRINT PRINT "Which? (1 - 4)"; DO S% = VAL(INKEY$) LOOP UNTIL S% >= 1 AND S% <= 4 PRINT S% IF S% = 4 THEN END ' Note: For brevity, no error checks on user inputs PRINT PRINT "Use negative numbers for directions opposite to those shown." PRINT DegIn "Observer's latitude (degrees North)", LT DegIn "Observer's longitude (degrees East)", LG INPUT "Time Zone (+/- hours from GMT/UT)"; TZN INPUT "Time (HH,MM) (24-hr format)"; HR, MIN INPUT "Date (M#,D#)"; Mth%, Day% PRINT CL = PY / 2 - LT ' co-latitude D = INT(30.6 * ((Mth% + 9) MOD 12) + 58.5 + Day%) MOD 365 ' day of year (D = 0 on Jan 1) A = W * D + SN ' orbit angle since solstice at mean speed B = A + E2 * SIN(A - SP) ' angle with correction for eccentricity C = (A - ATN(TAN(B) / CT)) / PY SL = PY * (C - INT(C + .5))' solar longitude relative to mean position C = ST * COS(B) DC = ATN(C / SQR(1 - C * C)) ' solar declination (latitude) ' arcsine of C. ASN not directly available in QBasic LD = (HR - TZN + MIN / 60) * WR + SL + LG ' longitude difference CALL P2C(LD, DC, sX, sY, sZ) ' polar axis (perpend'r to azimuth plane) CALL C2P(sY, sZ, sX, sAZ, sEL) ' horizontal axis CALL P2C(sAZ - CL, sEL, sY, sZ, sX) ' rotate by co-latitude IF sZ < 0 THEN BEEP PRINT "Sun Below Horizon" PRINT GOTO NewCalc END IF IF S% <> 2 THEN ' calculate and display sun's position CALL C2P(sX, sY, sZ, sAZ, sEL) ' vertical axis DegOut "Sun's azimuth: ", sAZ DegOut "Sun's elevation: ", sEL PRINT END IF IF S% > 1 THEN ' calculate and display mirror orientation PRINT "For target direction of light reflected from mirror:" DegIn "Azimuth of target direction (degrees)", tAZ DegIn "Elevation of target direction (degrees)", tEL PRINT CALL P2C(tAZ, tEL, tX, tY, tZ) ' target vector X,Y,Z CALL C2P(sX + tX, sY + tY, sZ + tZ, mAZ, mEL) ' angle bisection by vector addition PRINT "Mirror aim direction (perpendicular to surface):" DegOut "Azimuth: ", mAZ DegOut "Elevation: ", mEL PRINT END IF NewCalc: PRINT PRINT "New Calculation" PRINT GOTO Menu FUNCTION Ang (X, Y) ' calculates angle from positive X axis to vector to (X,Y) SELECT CASE SGN(X) CASE 1: Ang = ATN(Y / X) CASE -1: Ang = ATN(Y / X) + PY CASE ELSE: Ang = SGN(Y) * PY / 2 END SELECT END FUNCTION SUB C2P (X, Y, Z, AZ, EL) ' Cartesian to Polar. Convert from X,Y,Z to AZ,EL EL = Ang(SQR(X * X + Y * Y), Z) A = Ang(Y, X) IF A < PY THEN AZ = A + PY ELSE AZ = A - PY END SUB SUB DegIn (P$, X) ' Input angle in degrees and convert to radians PRINT P$; INPUT N X = N / DR END SUB SUB DegOut (P$, X) ' converts radians to degrees, rounds to nearest 0.1, and prints S$ = LTRIM$(STR$(INT(10 * ABS(X * DR) + .5))) IF S$ = "3600" THEN S$ = "0" IF LEN(S$) = 1 THEN S$ = "0" + S$ IF X < 0 THEN IF VAL(S$) THEN S$ = "-" + S$ PRINT P$; LEFT$(S$, LEN(S$) - 1); "."; RIGHT$(S$, 1); " degrees" END SUB SUB P2C (AZ, EL, X, Y, Z) ' Polar to Cartesian. Convert from AZ,EL to X,Y,Z Z = SIN(EL) C = -COS(EL) X = C * SIN(AZ) Y = C * COS(AZ) END SUB 100 REM SunAlign.BAS (Generic BASIC version) 110 REM Calculates position of sun in sky, as azimuth (compass bearing 120 REM measured clockwise from True North) and angle of elevation, as 130 REM seen from any place on earth, on any date and any time. 140 REM Also calculates alignment of a heliostat mirror. 150 REM David Williams 160 REM P.O. Box 48512 170 REM 3605 Lakeshore Blvd. West 180 REM Toronto, Ontario. M8W 4Y6 190 REM Canada 200 REM Original date 2007 Jul 07. This version 2007 Oct 07 210 REM Note: For brevity, no error checks on user inputs 220 CLS 230 PRINT "Use negative numbers for opposite directions." 240 INPUT "Observer's latitude (degrees North)"; LT 250 INPUT "Observer's longitude (degrees East)"; LG 260 INPUT "Date (M#,D#)"; Mth, Day 270 INPUT "Time (HH,MM) (24-hr format)"; HR, MIN 280 INPUT "Time Zone (+/- hours from GMT/UT)"; TZN 290 PY = 4 * ATN(1): REM "PI" not assignable in some BASICs 300 DR = 180 / PY: REM degree/radian factor 310 W = 2 * PY / 365: REM earth's mean orbital speed in radians/day 320 C = -23.45 / DR: REM reverse angle of axial tilt in radians 330 ST = SIN(C): REM sine of reverse tilt 340 CT = COS(C): REM cosine of reverse tilt 350 E2 = 2 * .0167: REM twice earth's orbital eccentricity 360 SP = 12 * W: REM 12 days from December solstice to perihelion 370 D = INT(30.6 * ((Mth + 9) MOD 12) + 58.5 + Day) MOD 365 380 A = W * (D + 10): REM Solstice 10 days before Jan 1 390 B = A + E2 * SIN(A - SP) 400 C = (A - ATN(TAN(B) / CT)) / PY 410 ET = 720 * (C - INT(C + .5)): REM equation of time 420 REM in 720 minutes, earth rotates PI radians relative to sun 430 C = ST * COS(B) 440 EL = ATN(C / SQR(1 - C * C)) * DR: REM solar declination 450 AZ = 15 * (HR - TZN) + (MIN + ET) / 4 + LG: REM longitude diff 460 GOSUB 800 470 R = SQR(Y * Y + Z * Z) 480 AX = Y: AY = Z: GOSUB 710 490 A = AA + (90 - LT) / DR 500 Y = R * COS(A) 510 Z = R * SIN(A) 520 GOSUB 740 530 PRINT : REM AZ & EL are now sun's azimuth & elevation in degrees 540 IF EL < 0 THEN PRINT "Sun Below Horizon": END 550 R = AZ: GOSUB 870: PRINT "Sun's azimuth: "; R; " degrees" 560 R = EL: GOSUB 870: PRINT "Sun's elevation: "; R; " degrees" 570 PRINT 580 INPUT "Calculate heliostat mirror alignment (y/n)"; K$ 590 IF K$ = "N" OR K$ = "n" THEN END 600 SX = X: SY = Y: SZ = Z 610 PRINT 620 INPUT "Azimuth of target direction (degrees)"; AZ 630 INPUT "Elevation of target direction (degrees)"; EL 640 GOSUB 800 650 X = X + SX: Y = Y + SY: Z = Z + SZ: GOSUB 740 660 PRINT : REM AZ & EL are now aim azimuth & elevation in degrees 670 PRINT "Mirror aim direction (perpendicular to surface):" 680 R = AZ: GOSUB 870: PRINT "Azimuth: "; R; " degrees" 690 R = EL: GOSUB 870: PRINT "Elevation: "; R; " degrees" 700 END 710 IF AX = 0 THEN AA = SGN(AY) * PY / 2: RETURN 720 AA = ATN(AY / AX): IF AX < 0 THEN AA = AA + PY 730 RETURN 740 AX = SQR(X * X + Y * Y): AY = Z: GOSUB 710 750 EL = AA * DR 760 AX = Y: AY = X: GOSUB 710 770 AZ = AA * DR 780 IF AZ < 180 THEN AZ = AZ + 180 ELSE AZ = AZ - 180 790 RETURN 800 E = EL / DR 810 A = AZ / DR 820 Z = SIN(E) 830 C = 0 - COS(E): REM Won't work without "0" in Liberty Basic 840 X = C * SIN(A) 850 Y = C * COS(A) 860 RETURN 870 R = INT(10 * R + .5): IF R = 3600 THEN R = 0 880 R = R / 10 890 RETURN

Topic by david williams    |  last reply

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