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
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… … LAMPS WITH CONCENTRIC LIGHT DIFFUSERS. Fig. 82. Illumination Curves for Lamps with and without Light Diffusers 37X 108 ELECTRIC LIGHTING LIGHT STANDARDS Inasmuch as sources of light are compared with one another inphotometry, we must have some standard, or unit, to which all lightsources are…
Electrical engineering
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