Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 442
obe D. c.p. c.p. c.p. c.p. lo .... 47-1 46-8 41-7 351 I.. .... 63-7 61-5 53-2 ?8-5 I, .... 30-6 32-0 30-2 31-8 Ratio lu/I, 0-48 0-52 0-57 0-83 Loss ,, — 0-8 11-5 25-4 70 ao 90 The light below these globes isdue in part to the tip of the mantlewhich could be seen through adraught hole below the… … Fig. ^^.—Polar Curves of Tunu^tcii Lam]) witliCut Glass Sjihere (H) and Clear MouldedStalactite (C). 428 THE ILLUMINATING ENGINEER. ^1 -o|oc.f> zjt 13 0
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
