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1000 Wire Temperature 20 Watt Input 200 watt tungsten 4.0 microns activity applying assymetric conductance bismuth sulfide cell bismuth sulfide powder bismuthinite black body caesium Cathodic sputtering Cd/Au Cell response voltage cell showed chemical copper cuprous oxide Current response curves Fig direct radiation Electrodeposition Energy input constant equation experimental cells external resistance graphite high photosensitivity increased Input to Wires investigation laboratory-prepared bismuth sulfide lamp at 12 light transm log I/T2 lumen radiation Metal Evaporation microamp muth sulfide nichrome ohms Peltier e.m.f. peratures photoactive material photoeffect PHOTOELECTRIC CELLS SENSITIVE photoresponse Planck's constant plate prepared bismuth sulfide radiant energy rectifier type Red and infra selenium cell semiconductor photoelements soft metal base solid photoelement spectral Table taken from Fig Temperature constant thermopile threshold frequency threshold wave length total photoelectric sensitivity unipolar conductivity Vacuum tube visible region watt tungsten lamp Wires FiC wires in radiator Wood's metal cell