Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 349
perature attained by a filamentdepends on the rate at which heat is radiated and the amount ofpower supplied. The rate of radiation of heat is proportional tothe area of the filament, the elevation in temperature, and theemissivity of the surface. By emissivity is meant the number of heat units… … Fig. 4. hence less energy is lost in heat radiation and the efficiency of thefilament is increased. As soon as incandescence is reached, the illumination increasesmuch more rapidly than the emission of heat, hence the increasein efficiency shown in Fig. 4. Were it not for the rapid disinte-gration…
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