## Step 5: **The MOST IMPORTANT Step** - Magnetize the Needle

If you take anything away from this project, please let it be this step. This step covers how to magnetize the needle for your compass, and how to read the results.

How to magnetize:
In order for your compass to point in the right direction you need to magnetize the needle, and you need to know how to do it correctly. Omitting or erroneously applying this step will result in a failure.

To magnetize your needle you need to stroke in the magnet along the needle in one direction, from eye of needle to point about 10 times. If using a paperclip or other portion of magnetic metal that isn't easily polarized by geometry, how can you tell which way is north? Make a small mark or indentation in the metal to determine which end to stroke towards, and always stroke toward the tip of the needle or mark on your paperclip. If you don't have a magnet you can magnetize the needle by using a piece of silk or other sheer fabric, again stroking on one direction. If you use silk you'll need to stroke needle about 50 times or more.

When the needle is magnetized it will be positively charged, meaning it will be attracted to a negative and repulsed by positive magnetic fields. once magnetized the tip of the needle will be polarized and will point towards the strongest magnetic pole, meaning north in the Northern Hemisphere and south in the Southern Hemisphere. From this initial bearing you should be able to determine the remaining cardinal bearings by drawing an imaginary line perpendicular to the needle bearing. Facing north, east is on the right with west on your left.

Remember, this information orients you based on magnetic poles, not geographic poles. More skilled compass users can ascertain the magnetic declination and determine true north from the readings. But this is optional and may not be required for rough readings.
<p>&quot;When the needle is magnetized it will be positively charged, meaning it will be attracted to a negative and repulsed by positive magnetic fields. Once magnetized the tip of the needle will be polarized and will point towards the strongest magnetic pole, meaning north in the Northern Hemisphere and south in the Southern Hemisphere.&quot; </p><p>Sorry, but the needle will point to the same pole no matter where you are in the world. The earth is a magnet. The needle is a magnet. The free-floating needle will align itself with the magnetic field of the earth, with the north-seeking pole of the magnet pointing to the North Magnetic Pole of the earth. The problem is that unless you know which end of the magnet is &quot;north&quot; and take care of which way you stroke the needle (toward or away from the eye), you won't really know which way the needle will point until you try it. </p><p>By the way, it's not just the tip of the needle that is magnetized; the needle is magnetized. Cut a magnetized needle in two and you will have two complete magnets. </p>
So if a make one and post it on here i get a 3 month pro membership to instructables
Mike, what you have described is almost exactly the recipe for a compass used by US prisoners of war in World War II German prison camps. You can see a display at the USAF Museum at Wright-Patterson AFB in Fairborn (suburban Dayton), Ohio. The display shows how prisoners made compasses for use in making their way back to Allied lines after an escape. Instead of a duct tape dish filled with water, they pressed a wooden cylinder into a vinyl phonograph record softened with a candle. They magnetized needles and floated them on cardboard discs. <br><br>I appreciate the variety of methods you offered for determining the points of the compass under all sorts of conditions. When a person is under stress it is easy to become confused and doubt otherwise reliable instruments. Confirming readings by a variety of methods helps keep someone from walking into disaster because he followed an inner sense rather than objective tools.
Thanks so much Phil, my grandpa took me to that museum when I was a kid and I've never been able to remember what it was called or exactly where in Ohio. One of the most creative things I remember from there were the extremely intricate home-made mousetraps, out of soup cans and such. Now that I know where it is I can take my own kids.
I am glad to have been of help. We took our kids there when they were old enough to benefit from the experience. I would like to go again, sometime; but now live far away in Idaho. I do not remember the mousetraps, but do remember a pendulum clock and a water wheel, all made from tin cans.
Despite all the naysayers I would like to thank you for the instructable. Although it may not be as simple as greasing up a needle, it's going to make a great activity for my cub scout group this Wed. Sometimes it's more about having a fun and educational time and coming out with a finished product the boys can keep.
I am an Electrical Engineer and wish to advise the silk alternative is totally incorrect, rubbing plastic with silk gives it a STATIC charge which is NOT the same as a magnetic field. Rubbing a needle with silk DOES NOT make it magnetic! There seems to be a lot of belief in this myth.<br>Actually, the typical needle will usually have already been magnetized by collapsing electric fields which are present in any building or home, or near any form of electrical system. See my book, &quot;KIDS' BOOK of ADVENTURE PROJECTS&quot; (Gary F. Hartman) for a complete and clear explanation of how this &quot;silk making a compass&quot; myth began. Ask any Electrical Engineer. We need to quit mixing up static electricity with magnet fields.<br>Gary F. Hartman
Thanks for responding. I've heard the same thing (rubbing silk along a needle does not make it magnetic), however I am just reporting the empirical evidence I encountered. Maybe it's just as you say, that my needle was previously magnetized.
Go to a site (for example that enclosed) which presents a scientific test , it seems ridiculous that people continue to further an incorrect myth. I am an old guy, and in school in the 50's we knew the difference. <br>Apparently modern education is sorely lacking. <br>Not all are fooled: Check this wilderness site from Canada. <br>http://www.wildwoodsurvival.com/survival/navigation/rbimprovisedcompass01.html
Absolute overkill. Why the heck do you make it that complicated? If I omit the simple fact, that needle itself smudged with little bit of grease floats by itself (water tension keeps it floating), what about to take bit of a duct tape, stick needle to it and throw it on the water. I'm sorry, this is sooo unpractical.
Sounds like you have it figured. <br />Why don't you show us how it's done, and post your version?
Absolutely no offense. <br>I'm just pointing out on the simple fact, that if you are in emergency, you will probably use the least amount of energy and effort to find north. This is not what I would do. Nothing else.
So, does that mean you're not going to put your money where your mouth is?<br />No offense, but your statement doesn't hold much water (pun intended) without some evidence.<br /><br />If you post the results you'll earn your self a 3-month Pro Membership, too.
Does it mean, that I have to make an Instructable to prove you I'm &quot;putting my money where my mouth is&quot;? Are you serious?<br>I have to say I like Instructables a lot, but for some people it starts to be a way of life. Ok, no problem, but it is not my way of life.<br>Sometimes is better to just go out and look. What about google (takes 3 seconds)?<br>http://www.survivaltopics.com/survival/make-a-floating-needle-compass/<br><br>Also, you last comment is irrelevant to the topic.
Whoa guys, cool your jets!<br /><br />Instructables is all about sharing ideas and iterating on them. Mikeasaurus, you did a fantastic job of documenting this project. Thank you!<br /><br />Please keep your comments constructive and helpful. As my mother always taught me, if you don't have something nice to say, it's better not to say anything at all. <br /><br />Cheers,<br /><br />Laura<br />Editor, Instructables.com<br />
I'm cool, don't worry. If I hurt somebody's feelings, I apologies.<br><br>Laura, I'm however disappointed, that non-offensive conflict of opinions is discouraged here. Conflicts of opinions means evolution and it can generates innovative idea's. That's my motto.
Okay, sorry for commenting late on a post and everything, but dude, Fogl. Non-offensive is not how I'd describe your comments. You're essentially telling Mikeasaurus that his Instructable is useless and that we could all do without it. That isn't non-offensive. What you need to do is to say something constructive, like, &quot;Hey, mikeasaurus, I like the idea of a simple compass, but wouldn't it be more convenient if you just used a needle with some grease on it? Duct tape and cork can be bulky.&quot; You do not need to add the 'sooo unpractical.' Also, as you type your comments, look down slightly. You will see the &quot;be nice&quot; policy clearly outlined. Thank you for your time.
Jimmy, &quot;Dude&quot;, I didn't say it is useless, I didn't say we could all do without it. Don't put words in my mouth, it is not very smart.<br>Anyway, you are commenting 6 month too late, you are neither positive or constructive (telling me what &quot;I need to do&quot; is not constructive, it is dictatorial) and actually, I would describe your post as &quot;opening old wounds&quot;.<br>So please stop now and let it be. Thank you.
I'm not the 'let it be' type. The word essentially means it's the essence of what you're saying, or my personal impression of your opinion. I was not putting words in your mouth. I would not like any animosity between us, I consider this a healthy battle of wits, and I will concede this victory to you.<br>Now I take this opportunity to be crass and unintelligent:<br>LOL WOUNDS!<br>Sorry about that. Anyway, cool.<br>P.S. It's funny how people think my name is Jimmy
i would rely on this compass. keep it in a backpack when camping. small in comparison to backpack.
I kinda agree with Fofl.. it is a complicated process you have for the floating needle compass. I have found another link on Wikipedia with a picture of the floating needle.<br>http://es.wikipedia.org/wiki/Archivo:Compass-floating_needle_on_water.jpg<br>Thanks Daniel
DD and I added a dram vial of tobacco and cayenne pepper to make outdoor survival kits. However, despite the clear instructions, I'm still not sure how we ended up with east/west magnetism in the needles.
Maybe you accidentally discovered monopoles! Quick, tell a physicist!
<strong>Silk doesn't work?</strong><br> <br> I was about to ask how the silk was supposed to magnetise a pin/needle because I'd never heard that before and it made no sense to me. But instead I had a quick Google and it seems it is a long-perpetuated urban legend:<br> <br> &nbsp;&nbsp; http://www.wildwoodsurvival.com/survival/navigation/rbimprovisedcompass01.html<br> <br> I've magnetised many a needle with another magnet in my time, and that makes logical/physical sense, because the magnetic domains within the steel align to the field of the needle.<br> <br> But steel is an electrical conductor: even if silk can be used to generate a static charge on some insulators it is not going to work on a conducting needle, and in addition to this a static charge has nothing to do with magnetism anyway.<br> <br> So silk is just not going to work.&nbsp; It is possible that the needle you choose to rub with a piece of silk is already partly magnetised, however, but the silk is not going to change that either way.<br>
Great job! Interesting also!
This is absolute amazing!!!!!Best instructable I have ever seen!!!
Thanks <strong>vishalapar</strong>!<br /> Sometimes I need contests like the Duct Tape one to come up with ideas like this.
compass from safari's icon lol :D
This reminds me of Monkey Island :)<br>well, i dont like to travel, im a city man, but i found this very useful, thanks for posting :)
Excellent 'ible. Having been a scout in my youth and learning many survival tips and techniques, this is a really good skill for everyone to know. Emergencies happen when you least suspect them (of course).<br><br>Just one thing you might want to add, is more information on the magnitised needle. Since you instructed how to magnetise it by moving from the eye to the tip, it's important to note the polarity of the tip. Since the needle has two ends, it needs to be clarified which end points north and which end is south.<br><br>For what it's worth, most hardware stores sell cork buttons used to protect furniture or to act as &quot;feet&quot; under objects so they won't scratch a surface. (They come as a card of six or ten) One of those could make the compass project smaller if desired for more portability.<br><br>Again, great ideas and lots of info packed into a well-written instructable.<br><br>
Thanks LaserDave,<br /> <br /> Your concern regarding the polarity is a good one, but is already covered in Step 5 under the subheading<strong> How to read the bearings:</strong><br /> <p style="margin-left: 40px;"> <em>When the needle is magnetized it will be positively charged, meaning it will be attracted to a negative and repulsed by positive magnetic fields. The needle of your compass will point towards the strongest magnetic pole, meaning north in the Northern Hemisphere and south in the Southern Hemisphere. </em></p> <p> This notion is so critical it bears repeating, and possibly clarifying the information I've provided. Thanks!</p>
I wonder if it will still work well if don't have water and use urine.
Should work very slightly better since the urine is denser. But if you don't have water, I don't think knowing where north is will help you find it, and this is probably a waste of time... (and valuable &quot;water&quot;).
WOWZERS!
Nice one!
The coolest Duct Tape Instructable I've seen so far. Great!
Well done.
The stars dont move? I thought that earth was the center of the universe!<br><br>Joking... Very nice instructable!
Great Info, I learned a lot.<br>One thing to add to the using the stars method. <br>After finding the north star (or southern cross) you can roughly find any bearing by using your fist.:<br>Close one eye and extend your arm out straight making a fist. Line your thumb up with the north star and the other side of your fist will be 10 degrees from north.<br>Make a reference point in the sky and move one more fist length for 20 degrees and so on.<br>This was taught to me by as part of pilot training for when all systems are out and you can't see your compass. Seems to work much more accurately than I expected.