Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 407
with but a small amountof absorption of light. These consist of shades of clear glass havinghorizontal grooves that form surfaces which change the direction oflight by refraction or total reflection as is necessary. The diffusionof light is effected by means of deep rounded vertical grooves onthe… … 364 ELECTRIC LIGHTING 101
Electrical engineering
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
