Coblentz, W.W. · National Bureau of Standards · leaf 32
g temperature, a highreflectivity (hence low emissivity) in the infra-red and a lowreflectivity (high emissivity) in the visible spectrum. The puremetals, tungsten and molybdenum fulfill these conditions moreexactly than any other known metals, excepting tantalum, whichas a lamp filament, however,… … 400° 500c Fig. 9 711320—n 6 220 Bulletin of the Bureau of Standards [Voi.7,No.2 Thus far it has been impossible to obtain a large-sized sampleof pure osmium, to determine its reflectivity. In conclusion, the writer expresses his appreciation of the cour-tesy of Dr. Von Wartenberg in submitting his…
