. Carnegie Institution of Washington publication. 98 INFRA-RED REFLECTION SPECTRA. The aluminum was a sheet of commercial material. It took a high polish. Its reflecting power is unusually high beyond lo/x, and is known to be practically a perfect reflector for heat waves at 25 //,. Little can be said concerning tin. It was found impossible to give it a polish, although the melted surface on cooling was very bright. From its electrical conductivity it ought to have a reflecting power of the order of nickel and platinum. \^^^ -JO-fc^. 678 FIG. metals. Zinc is the most interesting of a
. Carnegie Institution of Washington publication. 98 INFRA-RED REFLECTION SPECTRA. The aluminum was a sheet of commercial material. It took a high polish. Its reflecting power is unusually high beyond lo/x, and is known to be practically a perfect reflector for heat waves at 25 //,. Little can be said concerning tin. It was found impossible to give it a polish, although the melted surface on cooling was very bright. From its electrical conductivity it ought to have a reflecting power of the order of nickel and platinum. \^^^ -JO-fc^. 678 FIG. metals. Zinc is the most interesting of all the metals studied. It takes an unusually high polish which is quite permanent. Its color is peculiar. It seems to have a low reflecting power in the visible spectrum, which rises suddenly to a maximum beyond 4 p, and in this respect compares favorably with silver, which is the highest and most serviceable reflector known for the visible and the infra-red spectrum. The electrical con- ductivity, as well as the reflecting power, of zinc and of cadmium are close in agreement. The indium mirror was obtained by polishing a sheet about 3 by 2 by cm. It was not free from scratches, but took a high polish. It has a slightly higher reflecting power than platinum. Its electrical con-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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