g been subjected to the at 30 deg. to 40 deg. C. it partially decomposes and which I have constructed, I succeeded recently in action of the undulating light is developed in the or- gives off oxygen; at 80 deg. to 100 deg. its decomposi- attaining very good results with a film speed of 20 tion is… … small quantity of water, decomposes violently with disengagement of oxygen and leaves a residue of caus- ¥ig, 1.—THE FILM-CASING OPEN. - of hydroxyl chemically pure and in all degrees of con- tic soda. This reaction is accompanied with consid- centration up to 85 per cent. erable heat, and the…
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