IN his paper on the registering microphotometer, P. P. Koch (Annalen der Physik, iv. 39, p. 705, 1912) describes an arrangement consisting of two similar photoelectric cells connected to an ...
RECENT work in this Laboratory involved the exposure of a red-sensitive cæsium photoelectric cell to direct sunlight, the cell output being fed to a high-gain audio amplifier and a loud-speaker ...
Scientists have found electricity flowing in an unexpected place — across the surfaces of rocks. Mineral coatings on rocks turn sunlight into electricity, turning on like a light switch when the sun ...
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