Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 69
The outer endof the second tube was also covered with a non-reflecting hood,and the room was, of course, darkened when photometric mea-surements were taken. The rigid exclusion of all reflected ordiffused light is believed to be the only trustworthy method ofobtaining true results, and will, no… … Fig. 27. arising from the difference in color, were at first thought to beconsiderable, but further practice and experience enabled theobserver to overcome them to such an extent that the error arisingfrom this cause is inconsiderable, being greatly less than that dueto the fluctuations of the…
Electrical engineering
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