Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 600
Concentrating Reflector. Nearly all the light throwndownwards, and upper part of roomin comparative darkness. Source oflight completely screened from theeyes by opaque reflector. … 568 THE ILLUMINATING EN(!INEER. Besides providing enough light for the surroundings in a room to be seenwith comfort, il is most important that Oie illumination on the spot cohere thework is actually carried out should be sufficient. Experi-nf 111 af ^°^ shows that in order to read ordinary print…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
