Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 103
I I I I I M I I I I l[l I I I 11 l| III |Mi-pm-| Fig 88. The essential parts of the Photometer (see fig. 88) are the Bench (orTrack), the Scale, the Screen, and the Standard Light. The Bench is the structure upon whicli the Screen is moved when getting abalance. It must be accurately straight and… … The Scale is mounted upon the Bench. It is uniformly dividedinto 100 or 1000 equal parts. Or it may be, and this is much to be pre-ferred, an Inver§e Square Scale. Such a scale is determined byusing equation (34), calling K unity, and, assigning various values to I,determining the corresponding…
Electric apparatus and appliances · Equipment and supplies
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