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 414
centric Diffisp- a greater area and the light is so diffused as to obliterate shadows inthe vicinity of the lamp. Table XXIII gives the efficiency ofdifferent globe combinations for street lighting, assuming the opalinner and the clear outer globes as 100 per cent. PHOTOMETRY Photometry is the art… … Fig. 81. Diagram Showing Effect of the Concentric Diffuser jdifferent types of lamps as sources of illumination, together with theirefficiency; also, by means of the principles of photometry, we are ableto study the distribution of illumination for any given arrangementof light sources. uAMPS WITH…
Electrical engineering
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