Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 31
ion of testing the lamp isas follows: A lamp of known candle- * Ilhim. Ewj., Lond., vol. iv.. May, 1911, p. 20f. 14 THE ILLUMINATING ENGINEER. power is first placed in position. Thestandard surface G is observed throughthe Holophane Lumeter, and its dis-tance on the rod is adjusted until thereading… … Fig. 2.—New form of Polar Curve Apparatus. A, main svipport; B, pedestal; C, adjustable hori-7.oiital Bupport: U, adjustable vertical rod carryinglamp to be tested: B, pivot about which F rotatea;F. rotating rod, carrying celluloid screen ; G, celluloidscreen; H, screen for cutting off direct…
Lighting
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