A PHOTOELECTRIC SCALE-READER
Creators:Dickey, Fred P.
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Publisher:Ohio State University
“Putting grating-circle readings on the chart of a direct-recording spectrometer by observation and pipping is tiresome and usually not precise enough to utilize the full quality of the graduations. A photoelectric reading device will be described which can be used in a vacuum spectrometer. The reticle of the reading microscope is replaced by an evaporated-film cadmium sulfide photoconductive cell having narrow, closely spaced electrodes. The electrodes may be used as a bifilar reticle visually or to indicate scale graduations photoelectrically in conjunction with a 10 cps amplifier and a lamp with modulated filament.”
Author Institution: Department of Physics and Astronomy, The Ohio State University
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