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"I think the chemisty would probably be best done in the leg areas."What chemistry?
Anyway, it's possible to build your own cloud chamber and you can use a Peltier cooler aray rather than dry ice.Unfortunately I suspect the answer to "If I wanted a relatively quiet and child friendly cloud chamber, ideally on the scale of a dinning table, where would I start? " might be that you would start by winning the lottery.On a smaller scale, it's quite possiblehttp://www.instructables.com/id/Make-a-Cloud-Chamber-using-Peltier-Coolers/ [Links inactive - To make links active and clickable, login or click here to register]