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 322
taken up under Photometry. The mean hemisphericalcandle-power has reference, usually, to the light given out belowthe horizontal plane. The spherical reduction factor for the ordinarytungsten lamp is from .78 to .79. 286 ELECTRIC LIGHTING 23 SPECIAL VAPOR LAMPSSTANDARD MERCURY VAPOR LAMP Operating… … ■JOO 290 Z(iO° ^jp° BSOFig. 17. Vertical Distribution Curve of a Mazda Lamp In this lamp mercury vapor, rendered incandescent by the passageof an electric current through it, is the source of light. In its stand-ard form this lamp consists of a long glass tube from which the airhas been carefully…
Electrical engineering
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