Please Rate this Instructable and follow me for more cool step by step guides.

Made By Manish Kumar, Murtaza Tunio and Minaam Abbas

The Ruben's Tube is a physics experiment demonstrating a standing wave. It demonstrates the link between sound pressure and sound waves.

A length of pipe is perforated along the top and sealed at both ends - one seal is attached to a small speaker or frequency generator, the other to a supply of a flammable gas (propane tank). The pipe is filled with the gas, and the gas leaking from the perforations is lit. If a suitable constant frequency is used, a standing wave can form within the tube. When the speaker is turned on, the standing wave will create points with oscillating (higher and lower) pressure and points with constant pressure (pressure nodes) along the tube. Where there is oscillating pressure due to the sound waves, less gas will escape from the perforations in the tube, and the flames will be lower at those points. At the pressure nodes, the flames are higher. At the end of the tube gas molecule velocity is zero and oscillating pressure is maximal, thus low flames are observed. It is possible to determine the wavelength from the flame minima and maxima by simply measuring with a ruler.

Since the time averaged pressure is equal at all points of the tube, it is not straightforward to explain the different flame heights. The flame height is proportional to the gas flow as shown in the figure. Based on Bernoulli's principle, the gas flow is proportional to the square root of the pressure difference between the inside and outside of the tube. This is shown in the figure for a tube without standing sound wave. Based on this argument, the flame height depends non-linearly on the local, time-dependent pressure. The time average of the flow is reduced at the points with oscillating pressure and thus flames are lower.

Step 1: What You Need


Drilling Machine
A Long Metal Tube
Gas Pipe
Gas Cylinder
Speaker Wire
Guitar Amplifier
Crocodile Clips
Stands for the Ruben's Tube
Wire Strippers
Screw Drivers
Amplifier Wire (PC to Amplifier)
How most Rubens tubes are shown being built on the internet are not safe and this is a perfect example. <br>1) one end should be welded shut. do you want the card board to burn and shoot gas from the end when the card board fails. <br>2) You do not use hose clamps on flame effects feeding gas. use propane lines with NPT threads and threaded fittings on the tube or swaglok fittings. <br>3) The end that the speaker is placed should not use latex gloves or anything else with a low melting point. It needs to be a high temp rubber. Not doing these things can result in a catastrophic failure of large amounts of gas coming out of the end and even having a flaming propane hose whipping around in the air. Taking my steps would also help make it NFPA 160 compliant for safety to be used in front of an audience. NFPA 160 is the code that covers fire in front of an audience that governments around the world use to regulate fire in front of an audience. Don't put your self and other innocent bystanders at risk <br>I am a professional Flame effect artist.<br>www.trailertrashman.com
<p>Hey look, somebody who knows what they're talking about!<br></p><p>Another problem I see with this is that no mind is being given to the materials that are being used for hoses/etc. Are they going to dissolve with them come into contact with a petroleum product?<br><br>Everything you are doing with this that is made of &quot;plastic&quot; should be lined with PTFE (teflon). If you don't want to do that, you should use &quot;fuel lines&quot; from an automotive supply store (which will be petroleum compatible).</p>
You made my point exactly. I used to work at a business that makes hydrogen fuel cell and the NPT/Swagelok fittings came to mind. Thanks for making it safer.
Thank you, but I am 16 and unaware of a lot of stuff you mentioned above. But, I know that if it is welded shut you NEVER get good results. However I had the gas pipe end welded. And I always have a fire extinguisher nearby and I performed this experiment under adult-supervision.
<p>What happens if we can't afford an amplifier? Will the ruben's tube still work without an amplifier?</p>
yes,it will all u need is a boofer...it is an important part of the ruben's tube, a amplifier or a boofer should be there. thank you hope it will help you..
Also, use rubber not cardboard and a speaker roughly the same diameter of your tube. <br>Retired Chem Teacher
can you be more specific about which rubber to use?? surgical gloves or balloon will do? what should I use?? balloon or surgical gloves??
hello, I have completed this project.. But still I hav'nt attached a music system, for the orther end I have used a cardboard and a tape to cover it..will the speaker work with cardboard packing...
<p>hi... please please please answer my questions.. I'm 16 and we're making this for our project.. I just wanted to ask these questions to clarify because I'm afraid it will blow up..</p><p>1. I see you used propane. Can we use LPG / Liquefied Petroleum Gas?</p><p>2. If we use LPG, will the rubber on the end burn up?</p><p>3. How thick is the latex rubber? can we use like, surgical gloves?</p><p>I really really hope you see this as soon as possible... Thank you so much... anyone who sees this may help me too..</p>
<p>Probably too late to answer you but LPG is propane. They are one in the same.</p><p>LPG is a liquid when compressed. When the pressure is reduced, as in when it comes out of the tank, it becomes a gas.</p>
<p>The gas needs to be gas! Seriously though, your fuel needs to be gaseous. If you don't want to use propane, you could try natural gas (for example, form a lab gas outlet) or possibly butane. The logic behind this is that the speaker creates areas of high and low pressure in the gas, which I don't think would happen with liquid.</p>
<p> <br> <br>I really enjoyed <br> reading this post, big fan. Keep up the good work andplease tell me when can <br> you publish more articles or where can I read more on the subject?</p><p><a href="http://www.monacopropertylistings.com" rel="nofollow">immobili in vendita a monaco</a></p>
Also, use rubber not cardboard and a speaker roughly the same diameter of your tube. <br>Retired Chem Teacher
Try smaller diameter pipe from plumbing section and put smaller holes 1/2&quot; or less apart. <br>Retired Chem Teacher
<p>I plan on putting it on my desk, good idea? be desk has two &quot;layers&quot; (I guess) a lower layer where all the computer's and stuff go and the upper level where there is.. Nothing, at all... good idea? I think it would be cool.</p>
<p>As long as it isn't too close to the ceiling or any objects you should be fine, but remember the paint on the wall may be flammable, and even if not you will have huge soot marks. I wouldn't risk it, but yeah</p>
<p>guys what kind of metal tube.. going on selecting a random metal tube can cause HORROR !! first off it can metal downn ... 2nd temp it can handle all thesee matters i guess... i would prefer u guys can be more specific :D any great job and dont take me harshlyy.. sorry if i was.. and please tell what kind of tube !</p><p>WHICH METALL :)</p>
<p>How to make the fitting for the tube on the pipe...</p>
would be awesome to make a 2d version of this
While not proclaiming any experience directly related, this does ring a little intuition bell that it would seemingly be related to the 'ram air' affect use in tuning the air intake on cars to alter/maximize the pressure of the intake charge at the right time in the 4 stroke cycle. <br> <br>Time and time again I keep seeing things that are relate to frequencies. This would seem to be one of them. <br> <br>Cool stuff! And without 'dangerous experiments', our society would never have gotten off the ground. No one should stifle their curiosity! Have at it!
<p>wonder if you could use this to tune the length of an exhaust?</p>
I was wondering how hot the pipe gets? Wouldn't the end fittings melt?
cool rubens cube
What is the diameter of the tube you used?
Internal Diameter was 5 cm. External was probably 5.4 cm.
Where did you get the stands from?
I got them welded from a factory.
I have built a tube just like yours with a colleague, you can see it in action here: http://www.youtube.com/user/rubenstube101
Wow, that looks really good. If you liked my Instructable, then please rate it and follow me for more awesome stuff. :)
Ash and charred bone, <a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="Coach Outlet"><strong>Coach Outlet</strong></a> the earliest known evidence of controlled use of fire, reveal that human ancestors may have used fire a million years ago, <a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="Coach Factory Outlet"><strong>Coach Factory Outlet</strong></a> a discovery that researchers say will shed light on this major turning point in human evolution.<a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="Coach Outlet Stores"><strong>Coach Outlet Stores</strong></a> Scientists analyzed material from Wonderwerk Cave in South Africa, a massive cavern located near the edge of the Kalahari Desert.<a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="Coach Outlet Online"><strong>Coach Outlet Online</strong></a> Previous excavations there had uncovered an extensive record of human occupation.Microscopic analysis revealed clear evidence of burning,<a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="Coach Factory"><strong>Coach Factory</strong></a> such as plant ash and charred bone fragments. These materials were apparently burned in the cave,<a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="Coach Factory Outlet online"><strong>Coach Factory Outlet online</strong></a> as opposed to being carried in there by wind or water, and were found alongside stone tools in a layer dating back about 1 million years.<a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="coach outlet store online"><strong>coach outlet store online</strong></a> Surface fracturing of ironstone, the kind expected from fires, was also seen.Although modern humans are the only human species alive today,<a href="http://www.coach-outlet-storefactory.com/coach-classics-c-2.html" rel="nofollow" title="Coach Classics"><strong>Coach Classics</strong></a> originating about 200,000 years ago, other human species once roamed the Earth, such as Homo erectus, <a href="http://www.coach-outlet-storefactory.com/" rel="nofollow" title="http://www.coach-outlet-storefactory.com/"><strong>http://www.coach-outlet-storefactory.com/</strong></a> which arose about 1.9 million years ago.
What size of holes are drilled along the top and does it matter what gas pressure you have?
Umm the smallest size you get is better. Ours was around 2mm each. The gas pressure doesn't matter really but greater gas pressure is better. Please Follow me. :P
Days before University of Virginia lacrosse player Yeardley Love died of a blow to her head,<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="Christian Louboutin"><strong>Christian Louboutin</strong></a> her enraged ex-boyfriend sent her an email stating, &quot;I should have killed you,&quot;<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="Christian Louboutin Shoes"><strong>Christian Louboutin Shoes</strong></a> according to the prosecution's opening statement today in the murder trial.<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="Christian Louboutin Sale"><strong>Christian Louboutin Sale</strong></a> George Huguely V was furious because he had learned that Love had slept with someone else,<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="Cheap Christian Louboutin"><strong>Cheap Christian Louboutin</strong></a> prosecutors said.Huguely, 24, has pleaded not guilty to first-degree murder and five other charges.<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="Christian Louboutin On Sale"><strong>Christian Louboutin On Sale</strong></a> His trial in Love's 2010 death is expected to last two weeks.<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="Christian Louboutin Cheap"><strong>Christian Louboutin Cheap</strong></a> After learning that Love had slept with someone else, Huguely emailed Love, <a href="http://www.christianlouboutin-shoesonline.com/christian-louboutin-boots-c-5.html" rel="nofollow" title="Christian Louboutin Boots"><strong>Christian Louboutin Boots</strong></a> &quot;I should have killed you,&quot; prosecutor Warner Chapman said in his opening statement.<a href="http://www.christianlouboutin-shoesonline.com/new-christian-louboutin-c-20.html" rel="nofollow" title="Red Bottoms"><strong>Red Bottoms</strong></a> Chapman's opening statements described Love's allegedly slow and painful death. <a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Outlet"><strong>Coach Online Outlet</strong></a> He described Love's injuries as so bad when her body was discovered <a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Factory"><strong>Coach Factory Online</strong></a> that the medical examiner had to dissect her brain to discover the cause of death,<a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Factory Outlet"><strong>Coach Factory Outlet Online</strong></a> which was determined to be &quot;blunt force trauma to the head.<a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Outlet Store"><strong>Coach Outlet Store</strong></a> Chapman said that Love lay in her bed for two hours dying after being allegedly assaulted by Huguely,<a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Outlet Online"><strong>Coach Outlet Online</strong></a> who claimed that Love simply had a bloody nose when he left her room. <a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Factory Outlet"><strong>Coach Factory Outlet</strong></a> Her nose was not injured, the prosecutor said.<a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Factory"><strong>Coach Factory</strong></a> The description brought Love's mother and sister to tears.<a href="http://www.coach-store-factoryoutlet.com/" rel="nofollow" title="Coach Outlet"><strong>Coach Outlet</strong></a> Lexie Love, Yeardley Love's sister, hunched over and sobbed as her fiance comforted her.<a href="http://www.christianlouboutin-shoesonline.com/" rel="nofollow" title="http://www.christianlouboutin-shoesonline.com/"><strong>http://www.christianlouboutin-shoesonline.com/</strong></a> Chapman also claimed that Huguely had been violent with Love before.
Thank you, but I am 16 and unaware of a lot of <a href="http://www.schoolgrantsx.com/grants-for-women/" rel="nofollow">school grants for women</a> stuff you mentioned above. But, I know that if it is welded shut you NEVER get good results. However I had the gas pipe end welded. And I always have a fire extinguisher nearby and I performed this experiment under adult-supervision.
By <a href="http://www.2010griffeyshoes.net/" rel="nofollow" title="Ken Griffey Jr Shoes"><strong>Ken Griffey Jr Shoes</strong></a> one unofficial count, there are 33 menu items featuring chicken at Bobby Valentine's Sports Gallery Caf&eacute;, the restaurant right <a href="http://www.2010griffeyshoes.net/" rel="nofollow" title="Ken Griffey Shoes"><strong>Ken Griffey Shoes</strong></a> on Main Street in Stamford, Conn., whose owner is about to become the 45th manager of the Boston Red Sox.&quot;Award-winning&quot; Buffalo wings. Chicken <a href="http://www.2010griffeyshoes.net/" rel="nofollow" title="Griffey Shoes"><strong>Griffey Shoes</strong></a> &quot;Rollie&quot; fingers. Red-hot chicken poppers, spicy chicken nachos, four salads, five sandwiches, four wraps, burritos, quesadillas, two pastas, six <a href="http://www.2010griffeyshoes.net/" rel="nofollow" title="Griffeys Shoes"><strong>Griffeys Shoes</strong></a> pizzas, all featuring chicken.Seventeen varieties of beer by the bottle. A dozen beers on tap. And there's a bartop video game loaded with dozens of <a href="http://www.2010griffeyshoes.net/ken-griffey-jr-shoes-2012-c-4.html" rel="nofollow" title="Ken Griffey Jr Shoes 2012">Ken Griffey Jr Shoes 2012</a> different games.But unless Valentine springs one day for the postgame spread, you can be sure <a href="http://www.2010griffeyshoes.net/ken-griffey-jr-shoes-2012-c-4.html" rel="nofollow" title="Ken Griffey Shoes 2012">Ken Griffey Shoes 2012</a> all that will be off limits to any Red Sox pitcher looking for a midgame snack or entertainment while <a href="http://www.2010griffeyshoes.net/ken-griffey-jr-shoes-2012-c-4.html" rel="nofollow" title="Griffey Shoes 2012">Griffey Shoes 2012</a> his teammates are still in the dugout.The days of anything goes on Yawkey Way are about to end with the hiring of Valentine, the <a href="http://www.2010griffeyshoes.net/ken-griffey-jr-shoes-2012-c-4.html" rel="nofollow" title="Griffey 2012">Griffey 2012</a> soon-to-be ex-ESPN analyst who is out of the Dean Wormer generation when it comes to putting up with frat-house antics. And <a href="http://www.2010griffeyshoes.net/nike-ken-griffey-max-fury-2012-c-18.html" rel="nofollow" title="Nike Ken Griffey Max Fury 2012">Nike Ken Griffey Max Fury 2012</a> even though the portrait of the Sox clubhouse as an out-of-control playground for pampered millionaires <a href="http://www.2010griffeyshoes.net/nike-ken-griffey-max-fury-2012-c-18.html" rel="nofollow" title="Griffey Fury 2012">Griffey Fury 2012</a> has been vastly exaggerated, there is no doubt that the Red Sox are about to encounter a jarring new reality under Valentine, whose <a href="http://www.2010griffeyshoes.net/nike-ken-griffey-max-fury-2012-c-18.html" rel="nofollow" title="Nike Griffey Fury 2012">Nike Griffey Fury 2012</a> world view is considerably less tolerant than that of his predecessor, Terry Francona.
SANAA, Yemen (AP) &mdash; Yemen's autocratic <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin"><strong>Christian Louboutin</strong></a> leader agreed Wednesday to step down after months of demonstrations against his 33-year rule,pleasing the U.S. and its Gulf allies who feared that collapsing security in the impoverished nation was allowing an active al-Qaida franchise to step up operations.<a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Sale"><strong>Christian Louboutin Sale</strong></a> President Ali Abdullah Saleh is the fourth leader to lose power <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Shoes"><strong>Christian Louboutin Shoes</strong></a> in the wave of Arab Spring uprisings this year, following longtime dictators in Tunisia, Egypt and Libya.But the deal ushering Saleh from power grants him immunity from prosecution and doesn't explicitly ban him from the country's political life &mdash; <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Outlet"><strong>Christian Louboutin Outlet</strong></a> raising doubts that it will address Yemen's many problems.<a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Cheap Christian Louboutin"><strong>Cheap Christian Louboutin</strong></a> The deal opens the way to what will likely be a messy power struggle.<a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Online"><strong>Christian Louboutin Online</strong></a> Among those possibly vying for power are Saleh's son and nephew, who command the country's best-equipped military units; powerful tribal leaders; and the commander of a renegade battalion.Saleh had stubbornly clung to power despite nearly 10 months of huge <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Cheap"><strong>Christian Louboutin Cheap</strong></a> street protests in which hundreds of people were killed by his security forces. At one point, Saleh's palace mosque was bombed and he was treated in Saudi Arabia for severe burns. When he finally signed the agreement to step down, he did so in the Saudi capital of Riyadh after most of his allies had abandoned him and joined the opposition.Seated beside Saudi King Abdullah and dressed smartly in a dark business suit with a matching striped tie and handkerchief, <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin UK"><strong>Christian Louboutin UK</strong></a> Saleh smiled as he signed the U.S.-backed deal hammered out by his powerful Gulf Arab neighbors to transfer power within 30 days to his vice president, Abed Rabbo Mansour Hadi.<br><br><a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Discount"><strong>Christian Louboutin Discount</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/christian-louboutin-collection-c-18.html" rel="nofollow" title="Christian Louboutin Replica"><strong>Christian Louboutin Replica</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/christian-louboutin-collection-c-18.html" rel="nofollow" title="Replica Christian Louboutin"><strong>Replica Christian Louboutin</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/christian-louboutin-collection-c-18.html" rel="nofollow" title="Christian Louboutin Knockoffs"><strong>Christian Louboutin Knockoffs</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/christian-louboutin-sneakers-c-11.html" rel="nofollow" title="Christian Louboutin Sneakers"><strong>Christian Louboutin Sneakers</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/christian-louboutin-boots-c-5.html" rel="nofollow" title="Christian Louboutin Boots"><strong>Christian Louboutin Boots</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/new-christian-louboutin-c-20.html" rel="nofollow" title="Red Bottoms"><strong>Red Bottoms</strong></a><br><a href="http://www.christianlouboutinredbottoms.com/new-christian-louboutin-c-20.html" rel="nofollow" title="Red Bottoms Shoes"><strong>Red Bottoms Shoes</strong></a><br><br> He then clapped his hands a few times.&quot;The signature is not what is important,&quot; Saleh said after signing the agreement. &quot;What is important is good intentions and dedication to serious, loyal work at true participation to rebuild what has been destroyed by the crisis <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin On Sale"><strong>Christian Louboutin On Sale</strong></a> during the last 10 months.&quot;Saleh had agreed to sign the deal three times before, only to back away at the last minute.The power transfer will be followed by presidential elections within 90 days. A national unity government will them oversee a two-year transitional period.<a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Christian Louboutin Outlet Store"><strong>Christian Louboutin Outlet Store</strong></a> The deal falls far short of the demands of the tens of thousands of protesters who have doggedly called for democratic reforms in public squares across Yemen since January, sometimes facing lethal crackdowns by Saleh's forces.Protesters camped out in the capital of Sanaa immediately rejected the deal, chanting, &quot;No immunity for the killer!&quot; They vowed to continue their protests.President Barack Obama welcomed the decision, <a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="Discount Christian Louboutin"><strong>Discount Christian Louboutin</strong></a> saying the U.S. would stand by the Yemeni people &quot;as they embark on this historic transition.&quot;King Abdullah also praised Saleh, telling Yemenis the plan would &quot;open a new page in your history&quot; and lead to greater freedom and prosperity.Saleh, believed to be in his late 60s, addressed members of the Saudi royal family and international diplomats at the signing ceremony, portraying himself as a victim who sought to preserve security and democracy but was forced out by power-hungry forces serving a &quot;foreign agenda.&quot;<br><a href="http://www.christianlouboutinredbottoms.com/" rel="nofollow" title="http://www.christianlouboutinredbottoms.com/"><strong>http://www.christianlouboutinredbottoms.com/</strong></a>
With the deadline for the deficit-cutting Congressional <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin"><strong>Christian Louboutin</strong></a> supercommittee rapidly approaching, President Obama urged lawmakers today to abandon <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin Sale"><strong>Christian Louboutin Sale</strong></a> their &ldquo;rigid positions&rdquo; and reach a consensus, warning there are no &ldquo;magic beans&rdquo; to solve the deficit problem.&ldquo;My hope is that over the next several days, the congressional leadership on the supercommittee go ahead and bite the bullet and do what needs to be done <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Cheap Christian Louboutin"><strong>Cheap Christian Louboutin</strong></a> because the math won&rsquo;t change,&rdquo; Obama told reporters at a press conference. &ldquo;There&rsquo;s no magic formula. There are no magic beans that you can toss in the ground and suddenly a bunch of money grows on trees. We&rsquo;ve got to just go ahead and do the responsible thing.&rdquo;With just <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin Cheap"><strong>Christian Louboutin Cheap</strong></a> ten days to go, the president urged lawmakers not to try and change the automatic cuts triggered if the committee fails to lower the deficit by at least $1.2 trillion.&ldquo;The whole idea of the sequester was to make sure that both sides felt obligated to <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin Discount"><strong>Christian Louboutin Discount</strong></a> move off rigid positions and do what was required to help the country. <br><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin Heels"><strong>Christian Louboutin Heels</strong></a><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin On Sale"><strong>Christian Louboutin On Sale</strong></a><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Louboutin Outlet"><strong>Louboutin Outlet</strong></a><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Louboutins"><strong>Louboutins</strong></a><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Cheap Louboutin"><strong>Cheap Louboutin</strong></a><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Louboutin Sale"><strong>Louboutin Sale</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-shoes-c-6.html" rel="nofollow" title="Christian Louboutin Shoes"><strong>Christian Louboutin Shoes</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-shoes-c-6.html" rel="nofollow" title="Louboutin Shoes"><strong>Louboutin Shoes</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-boots-c-14.html" rel="nofollow" title="Christian Louboutin Boots"><strong>Christian Louboutin Boots</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-new-arrivals-c-344.html" rel="nofollow" title="Red Bottoms"><strong>Red Bottoms</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-new-arrivals-c-344.html" rel="nofollow" title="Red Bottoms Shoes"><strong>Red Bottoms Shoes</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-peep-toe-c-13.html" rel="nofollow" title="Christian Louboutin Peep Toe"><strong>Christian Louboutin Peep Toe</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-sandals-c-15.html" rel="nofollow" title="Christian Louboutin Sandals"><strong>Christian Louboutin Sandals</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-platforms-c-4.html" rel="nofollow" title="Christian Louboutin Platforms"><strong>Christian Louboutin Platforms</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-wedges-c-343.html" rel="nofollow" title="Christian Louboutin Wedges"><strong>Christian Louboutin Wedges</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-fashion-c-339.html" rel="nofollow" title="Wholesale Christian Louboutin"><strong>Wholesale Christian Louboutin</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-sneakers-c-340.html" rel="nofollow" title="Christian Louboutin Sneakers"><strong>Christian Louboutin Sneakers</strong></a><br><a href="http://www.christianlouboutin-highheels.com/christian-louboutin-pumps-c-3.html" rel="nofollow" title="Christian Louboutin Pumps"><strong>Christian Louboutin Pumps</strong></a><br><a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="http://www.christianlouboutin-highheels.com/"><strong>http://www.christianlouboutin-highheels.com/</strong></a><br><br><br>Since that time, they&rsquo;ve had a lot of conversations but it feels <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Louboutin"><strong>Louboutin</strong></a> as if people continue to try to stick with their rigid positions rather than solve the problem,&rdquo; Obama said. &ldquo;It <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Discount Christian Louboutin"><strong>Discount Christian Louboutin</strong></a> just feels as if people keep on wanting to jigger the math so that they get a different outcome. Well the equation, no matter how you do it, is going to be the same. If you want a balanced approach &hellip; then prudent cuts have to be matched up with revenue.&rdquo;The president, however, stopped short of saying he would veto a bill that attempts to turn off part or all of the sequester.&ldquo;I&rsquo;m not going to comment on whether I veto a particular bill until I actually see a bill because I still hold out the prospect that there&rsquo;s going to be a light bulb moment where everybody says &lsquo;ah ha,&rsquo; here&rsquo;s what we&rsquo;ve got to do,&rdquo; he said.Legal in the NFL: Scoring a touchdown and then running 100 yards down the sideline to give the ball to your girlfriend who's a cheerleader for the opposing team.Not legal in the NFL: Scoring a touchdown and saluting the troops on <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin Outlet"><strong>Christian Louboutin Outlet</strong></a> Veterans Day weekend.Denver Broncos wide receiver Eric Decker(notes) was assessed with an unsportsmanlike conduct penalty on Sunday after dropping to his knee and saluting in the end zone after a 56-yard touchdown reception from Tim Tebow(notes). The flag was <a href="http://www.christianlouboutin-highheels.com/" rel="nofollow" title="Christian Louboutin Outlet Store"><strong>Christian Louboutin Outlet Store</strong></a> thrown because Decker went to a knee, a celebration which has been illegal in the NFL since 2009.
The storm <a href="http://www.coachbagoutletfactory.com/" title="Coach Outlet"><strong>Coach Outlet</strong></a> also is affecting municipal elections Tuesday in Connecticut, where nine cities and <a href="http://www.coachbagoutletfactory.com/" title="Coach Outlet Store"><strong>Coach Outlet Store</strong></a>towns were moving and consolidating their polling places. Secretary of the State <a href="http://www.coachbagoutletfactory.com/" title="Coach Outlet Stores"><strong>Coach Outlet Stores</strong></a>Denise Merrill said some polling locations <a href="http://www.coachbagoutletfactory.com/" title="Coach Factory Outlet"><strong>Coach Factory Outlet</strong></a>do not yet have electricity while others have been damaged or are being used <a href="http://www.coachbagoutletfactory.com/" title="Coach Outlet Online"><strong>Coach Outlet Online</strong></a>as shelters and warming centers.Gov. <a href="http://www.coachbagoutletfactory.com/" title="Coach Factory"><strong>Coach Factory</strong></a>Dannel P. Malloy has called the duration of the outages unacceptable and has <a href="http://www.coachbagoutletfactory.com/" title="Coach Factory Outlet Online"><strong>Coach Factory Outlet Online</strong></a>launched an independent probe of the utilities' response.<a href="http://www.coachbagoutletfactory.com/coach-classic-bags-c-4.html" title="Coach Classic Bags"><strong>Coach Classic Bags</strong></a> He said the state is <a href="http://www.coachbagoutletfactory.com/coach-handbags-c-5.html" title="Coach Handbags"><strong>Coach Handbags</strong></a>keeping its legal options open in case there are grounds for<a href="http://www.coachbagoutletfactory.com/coach-kristin-bags-c-10.html" title="Coach Kristin Bags"><strong>Coach Kristin Bags</strong></a> recourse in the courts once <a href="http://www.coachbagoutletfactory.com/coach-purses-outlet-c-13.html" title="Coach Purses Outlet"><strong>Coach Purses Outlet</strong></a>the circumstances are <a href="http://www.coachbagoutletfactory.com/" title="http://www.coachbagoutletfactory.com/"><strong>http://www.coachbagoutletfactory.com/</strong></a>examined.
I have a question about this step (covering the audio input end). When you are done does it look like the pic with the yellow balloon? I am unclear about the cardboard. <br><br>I can see that touching the speaker cone to a rubber membrane would transfer sound energy rather easily but if covered with cardboard it would be pretty stiff.<br><br>If you are using the balloon as the transfer media, does the gas pressure inflate the balloon?<br><br>And another question: what size drill bit did you use? Do you have any guess as to what the effect of larger or smaller holes may have?<br><br>Thanks.
1) Yeah i used two balloons, i cut hole in the cardboard of the same diameter as the tube and like fit it there. The cardboard only acts as a structure to hold the speaker in place. It isn't completely necessary, i didn't use it either. <br><br>2) Yes the gas pressure does inflate the balloon that's why I covered it with like 5 balloons and then reinforced it with tape. :)<br><br>3) Well, i am not certainly sure if the size of the drill bit makes a difference, but I do know that gas stoves have small holes so it is advisable to have small holes otherwise the gas might escape quicker. :)
propane is heavier than air...I was told that natural gas is preferred because anything that does not burn up will float away instead of collecting in the tube to explode. Hope you have access to N gas, for safety
It would probably work well with a set of old computer speakers too. Just take the one speaker that has the volume and power controlls, and disconect the other. Detach the speaker from the body, extend the wires and use that. Then the volume controll and such can be tucked away some where nicely. Cheaper than an amp.
An Amplifier will help to increase the sound quality etc, also you can adjust bass and treble etc that way :)
Nice experiment, never heard of it, but could be nice to experiment with resonances and finding out ideal baffles. (If you don't explode first)
Hi Mani, great job man! Keep up with your passion and make all Pakistanis proud. Good job on the combat robot too.
Thank you :) do you live in Pakistan too?
Nope, I used to. Did my Alevels before moving abroad to go to college. I feel immense pleasure and pride when I see people like you stepping up and just doing what you enjoy. Kudos and hats off to you! Keep up the great work. The rubens tube is a visually fascinating experiment, the most fun I've had while studying wave theory I'll tell you that! :) Looking forward to seeing more instructables from you in the future!<br><br>

About This Instructable


271 favorites


Bio: I am an A-Levels Student at Karachi Grammar School, Pakistan. My passion is physics and mechanics and I want to be a Mechanical Engineer in ... More »
More by howtowithmanish: 12 Lego Kits DIY How to Make a Siphon Wave Generator Be a Detective : Finger Print and Foot Print Capture and Analysis
Add instructable to: