Emissivity of straight and helical filaments of tungsten (1918)
National Bureau of Standards · leaf 10
d illustratesseveral novel problems in radiation. As shown in the photo-graph, Fig. 1, the inside of the turn of the helix is much brighterthan the outside of the turn of the wire. In the present casemeasurements were made with a physical photometer 13 on thesame areas (indicated by the rectangular… … Fig. i.—Photograph of an incandescent helical filament of tungsten in a gas-filled lamp Coblentzi Emissivity of Tungsten 119 1. RATIO OF BRIGHTNESS Using a mirror of 50 cm focal length, an enlarged image of theinside and the outside of the turn was focused upon a slit, 1 by0.5 mm, placed so as to…
Rays and radiation · Lamps and lighting · Heat flow, thermal and thermodynamic processes
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