tfrom the lamp equal having similar squares, for a certain number of minutes the light of a standard candle, and at the same time to the light of the sun, andafterward developed, by dis- to see that the reading of the galvanometer is zero. solving out, with hot water, the parts of the film un- The… … Fig. 2—DIAGRAM OF CIRCUITS. Fig. 3.-SENSITOMETER SCREEN. mated one lamp will, on this account, be good for sev- eral thousand tests before the variation of the light will amount to more than one per cent, trifle more dense than its neighbor, and they are dis- dependent of the galvanometer, it is in…
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