Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 428
TRIC LIGHTING 119 obtained from Fig, 92. By means of a system of mirrors, the lightgiven by the lamp in several directions may be integrated and thrownon the photometer screen for comparison with the standard, the resultgi\ing the mean spherical candle-power from one reading. By cover-ing all but… … Fig. 93. Eighteen-Inch Integrating Sphere Equipped with Photometer within a sphere the interior walls of which are coated with a whitediffusing surface the illumination of that surface at any point is duepartly to the light falling on it directly, and partly to the lightreflected from the remainder…
Electrical engineering
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