Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 404
one having smaller units so distributed as to give the same minimum value. Since a uniform dis-tribution of light is de-cs • sirable, for economicreasons, the ideal distri-bution curve of a lampfor street lighting wouldbe a curve which showsa low value of candle-power thrown directlydownward, but… … Fig. 42. Curve A shows distribu- tion curvo for a H.O ampere, open, direct-current arc. Curve B shows distribution curve for a 6.6 ampere, D.C. enclo.sed arc. 334 ELECTRIC LIGHTING 53 Curve C shows distribution curve for a 7.5-ampere, A.C. enclosed arc.Globes used withB and C are opal, inner…
Architecture · Building · Carpentry
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