Abstract
Measurements have been made of the relative spectral sensitivities of a number of cesiumoxide photoelectric cells to visible and infrared radiations. For the region 5000A to 8000A where the results reported here overlap those of Koller and of Vedder, the sensitivities werefound to check those previously reported. The infrared response has been found to decrease gradually from the maximum at about 7750A to approximately zero at 12,OOOA.

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