Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 427
ting is the proper diffusion of the light so as to produce asoft even illumination, free from strong contrasts and deepshadows on the surface illuminated. The distribution of lightfrom enclosed arc lamps is much improved by the use of diffusersfor either the concentric or inverted type. The… … Fig. 3,462.—Concentric diffuser and lower shade as attached to an enclosed arc lamp. to the lamp casing in a manner similar to an ordinary reflector or shadeand in the place of an outer globe, a screening shade is used for sub-dividing the light directly under the lamp, and for reflecting a…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
