Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 80
circumstances. PrismaticReflection is such that the smaller thesotirce of light (that is, the nearer weapproach the point source) the greaterwill be the efiiciency of reflection, butalso it must be borne in mind that greatercare is necessary in placing the source inits proper focus. It is in this… … .Vio 6^RE TUNjiTEN STRRlG^T TiLquENT.SRMt- URMP WITH MOLOPHONC E TVPE MUlilMUM C.P. t lOO.= SAME LOMP WITH HOLOPhMNC E TyPC <^e.pi-ecToq. 70 THE ILLUMINATING ENGINEER (feb. 1916)
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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