Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 315
themirror above. Some of you have probably witnessed the extraordinaryaction of light upon a mixture of hydrogen and chlorine,and we may now exhibit this action in a sfciiking way.A transparent collodion balloon is filled with themixed gases. Lowering the upper reflector, the balloon issuspended… … carbon-points in thefocus of the lowermirror, the momentthey are drawn apart,the gases explode. Andremember, this is theaction of the light.You know that collo-dion is an inflammablesubstance, and hencemight suppose it to bethe heat of the coke-points which ignitesit, and that it ignitesthe gases.…
Heat
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