International Library of Technology · Scranton, International Textbook Co. · leaf 221
average value ofthese different readings. This mean horizontal candlepoweris sometimes obtained by taking the reading from the lampwhile it is rapidly revolved about its vertical axis. The 16 ELECTRIC LIGHTING. 23 photometers just described are arranged so that the lampmay be revolved at the rate… … Fig. 15. is shown by the irregular curve (Fig. 15). The distance ofthe points on this curve from the center represents the can-dlepower in the direction of the radius from that point, aridif the candlepower were the same in all directions, this curvewould become a circle. 29. Vertical…
Electrical engineering
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