. A comparative study of the light sensibility of selenium and stibnite at 20 [degrees] C. and -190 [degrees] C. .. . ao ^or> b. ^_. In measuring increased conductivity the usual method .vae em-ployed. A diagrar. shows the arrangerrent. In seme cases a counter was introduced atf^ the galvanometer terminalsto annul the dark deflect-ions; and, when the in-creased conductivity wastoo large, a shunt Kg wasT-i^u(^S. ^21 introduced to cut down this deflection. In some cases both counter , and shunt were unnec-essary. Both this galvanometer ( sensibility x 10^ amp.) anda deizice fo
. A comparative study of the light sensibility of selenium and stibnite at 20 [degrees] C. and -190 [degrees] C. .. . ao ^or> b. ^_. In measuring increased conductivity the usual method .vae em-ployed. A diagrar. shows the arrangerrent. In seme cases a counter was introduced atf^ the galvanometer terminalsto annul the dark deflect-ions; and, when the in-creased conductivity wastoo large, a shunt Kg wasT-i^u(^S. ^21 introduced to cut down this deflection. In some cases both counter , and shunt were unnec-essary. Both this galvanometer ( sensibility x 10^ amp.) anda deizice for exposing for the desired time were placed in an adjoin-ing room. In general, exposures of ten seconds were taken, and aninterval of three or four minutes elapsed between readings. Sensibility Curves at 20°C. and - 19C° C. Selenium 2C° C. In these observations selenium cells of the previouslymentioned type were used. Both the counter and shunt had to beemployed, and cbservetions were taken on a number of cells. Strictly speaking, the sensibility of a cell is the ratio ofthe two quantities, - the change in resistance pecomparativestudy00elli
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