. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. LIGHT SOURCES AND DETECTORS transistor circuits. The power available from the sun's radiation at ground level is about 1 kW/m^ and the popular name for the barrier-layer cell is becoming 'the sun battery'. 120 no > a> 100 90 80 70 '> 5) 60 50 40 30 20 10 1 1 1 1 1 1 1 \ 1 1— • Bradley'Luxtron'(no cover) o Vickers self-gererating photocell (lacquer-coated) n General Electric (glass cover) X Weston'Photronic'Type 3(glass cover) 4 Weston 'Photronic' Type 1 (glass cover).
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. LIGHT SOURCES AND DETECTORS transistor circuits. The power available from the sun's radiation at ground level is about 1 kW/m^ and the popular name for the barrier-layer cell is becoming 'the sun battery'. 120 no > a> 100 90 80 70 '> 5) 60 50 40 30 20 10 1 1 1 1 1 1 1 \ 1 1— • Bradley'Luxtron'(no cover) o Vickers self-gererating photocell (lacquer-coated) n General Electric (glass cover) X Weston'Photronic'Type 3(glass cover) 4 Weston 'Photronic' Type 1 (glass cover). 6,000 7,000 Wavelength A Figure Spectral response of various selenium barrier-layer cells of American manufacture Photo conductive cells Several substances exhibit the property of altering their electrical resistance when radiant energy falls upon them, and this enables them to be used as photodetectors. Interest in the detection of infra-red radiation during World War II resulted in the development of a number of photocells in this class. As light from a tungsten source contains much of its radiant energy in the infra-red, these detectors work well in conjunction with a tungsten lamp. The lead sulphide cell is the best known. 372. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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