ds, perhaps the most generally original negative. The film may be so long that the peroxide in a closed vessel provided with a pressure known is that employed by Mr. Edison, in which a gage; the. chamber contained also a vessel of water, speech or song to be recorded may be almost inter- stylus… … as in the cinematograph and similar chronophoto- formula. The hydrate of the peroxide of sodium dis- graphic machines. The reel is driven by a small elec- solves in water with a great lowering of temperature; tric motor through.the medium of a belt and pulley. in concentrated acids it dissolves…
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