International Library of Technology · Scranton, International Textbook Co. · leaf 218
en screen. The motor F is used to spin the lamp Bwhile measurements are being made; the reason for doingthis will be explained later. G and H are two adjustableresistances for keeping the voltage applied to the lamps atthe proper value. 26. Fig. 14 Shows a Deshler-McAllister photometer—a simple…
Electrical engineering
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