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3D3DCalcium hydride canister.
This canister is meant to be used to generate a volume of hydrogen gas to inflate a weather balloon. I think you poke out the indentation on the top and add water, but I'm not sure.
Source: eBay
Contributor: Theodore Gray
Acquired: 28 February, 2009
Text Updated: 1 March, 2009
Price: Forgot
Size: 6"
Composition: CaH2