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Incorporated, a worldwide network of science museums and related institutions.
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If a demonstrator is handling the equipment, it's as simple as a 
propane torch, a piece of steel pipe attached to a sturdy stand, and 
insulating gloves.  You might want a transparent plex shield between 
equipment and visitors because they want to be up close to hear the 
sound.  Science Museum of Minnesota's Traveling Experiment Gallery 
had a Ruben's Tube as part of a counter of activities moderated by 
volunteers, but we dropped it because it was rarely used.  There were 
so many other activities that it wasn't missed.

If a free-standing exhibit component, here in the US, we have to work 
with local fire departments to meet their regulations.  Usually we've 
had to plumb the exhibit into a building's gas lines and provide 
automatic shut-off valves in case the flame goes out.  They would not 
allow a portable gas supply in a tank under an exhibit.

The sound is simply WONDERFUL!  Best wishes, Jane

>Dear ASTC people,
>
>We have hit a problems with trying to builld a Ruben's tube (the standing
>waves
>in flames demo). We asked a company to quote for building one, and 
>they assured
>us that they
>wouldn't produce it without having a number of gas safety features installed
>to
>ensure it was safe. The cost went from something quite reasonable that we had
>budgeted up to 12k (which we can't afford!) I have seen the demo done a few
>times with limited safety features apparent so wanted to compare notes with
>others..
>
>Has anyone toured or travelled with this piece of kit, and can you advise on
>what safety features you use to prevent against gas build up or gas leaks?
>Have
>you had to increase your liability insurance or put any gas safety measures in
>place to operate it?
>
>Yours hopefully
>Wendy Sadler
>Director - science made simple
>www.sciencemadesimple.co.uk
>
>School of Physics and Astronomy
>Cardiff University
>5 The Parade
>Cardiff CF24 3YB
>
>Tel +44 29 20 876884
>Fax +44 29 20 874056




-- 
Jane Snell Copes			 
Science Outside the Box
10429 Barnes Way
Inver Grove Heights, MN  55077
651-451-3720

"Nothing is too wonderful to be true."   Michael Faraday

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