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It could certainly be a combustible mixture in the tube, but the holes act like a Davey lamp http://en.wikipedia.org/wiki/Davy_lampThe metal conducts the heat out of a flame fast enough that it cannot propagate through the hole.I would rather avoid copper, as it is expensive, heavy and easily damaged. I think soldering aluminium isn't as bad as all that, I just need to get a powerful gas torch
They register people trained to do gas installations. I think it stands for something-or-other of registered gas installers, but I'm not sure about that.http://www.trustcorgi.com/Pages/default.aspx
I am in the process of making a rubens tube for my physics class and having some difficulty. After lighting the tube I will only recieve a small blue flame instead of a larger orange flame. Also it won;t stay lit. It will go out almost immediately after lighting. Any help or suggestions would be much appreciated.
What would the optimum diameter for the tube be ? As this could cause a problem if copper were to be used and what distance did you put between your holes ? Thanks
I used 1mm holes at a 5mm spacing. I am not sure of optimum diameter. I think for a 1800mm tube like mine more the 50mm diameter is great for higher order modes, but the fundamental doesn't work quite so well. I also had a test tube which was only 20cm long which would only do fundamental and first harmonic, I think because the cross section was larger than the second harmonic, so complicated 3D standing waves started happening.