Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . s. Fig. 224, and those ofthe gas-filled variety, Fig. 225, are designated as Mazda C filaments of the gas-filled lamps are intensely brilliant andwhere they come within the line of vision should be screened fromthe eyes. The high efficiency of these lampspermit the use of opal shades to produce a de-sired illumination at a rate of cost that com-pares favorably with the unscreened light of thevacuum lamps. Daylight Lamps.—The color of the light froman incandescent electric
Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances . s. Fig. 224, and those ofthe gas-filled variety, Fig. 225, are designated as Mazda C filaments of the gas-filled lamps are intensely brilliant andwhere they come within the line of vision should be screened fromthe eyes. The high efficiency of these lampspermit the use of opal shades to produce a de-sired illumination at a rate of cost that com-pares favorably with the unscreened light of thevacuum lamps. Daylight Lamps.—The color of the light froman incandescent electric lamp depends on thetemperature of the filament. In the case of thegas-filled Mazda lamp the high filament tem-perature produces a light that differs markedlyfrom the vacuum lamps in that it contains agreater amount of blue and green rays. It istherefore possible to produce light that is thesame as average daylight. Gas-filled lamps withglobes colored to produce light of noonday quality are producedat an expenditure of watts per candlepower. In the matching of colors, it should be kept in mind that the. Fig. 225.—750-watt Mazda Clamp (Ji scale). ELECTRICITY 325 tint of any color is influenced by the kind of light by which it isviewed. Colors matched by ordinary incandescent light con-taining a large percentaga of red rays cannot produce the sameeffect when the same articles are seen in light of differentquality. The daylight lamps are therefore intended to be usedunder conditions that require daylight quality. Miniature Tungsten Lamps.—The wonderful light-giving prop-erties of tungsten has made possible the use of miniature in-candescent lamps for an almost infinite variety of usages. Theminiature lamps are similar in action to other incandescent elec-tric lamps except that they are operated on voltages lower thanis used on commercial circuits. When used on commercialcircuits, incandescent tungsten lamps of less than 10 wattscapacity require filaments that are too del
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