International Library of Technology · Scranton, International Textbook Co. · leaf 216
istance from the lamp to the screen must be 100 — 20 = 80 inches.The candlepower of the standard is 1; hence, substituting in formula 2, /i = lX 80*202 16 c. p. Ans. 24. The Biinsen Photometer.—The Bunsen photom-eter has been more largely used than any other. It isvery simple and is capable of… … used. It would be a difficult matter to tell when a simplescreen like that shown in Fig. 11 was illuminated equally onboth sides, and to overcome this difficulty Prof. Bunsendevised the screen shown in Fig. 12. The screen is madeby taking a piece of good quality of white paper and makinga grease…
Electrical engineering
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