. Carnegie Institution of Washington publication. 102 INFRA-RED EMISSION SPECTRA. of the emission bands on the side of the spectrum toward the short wave- lengths. Further examples will be found in figs. 77 and 78. In this and in the preceding substance the emission bands are not so sharp as usual, which may be due to the greater molecular weight of the base. Porcelain (Pyrometer Tubing). (Hollow rod 15 by 2 mm. (hole 1 mm.). Energy supplied, watts. Fig. 69.) The sample of pyrometer tubing examined was heated to a light-red color (14000) to keep it conducting. The energy spectrum is marked
. Carnegie Institution of Washington publication. 102 INFRA-RED EMISSION SPECTRA. of the emission bands on the side of the spectrum toward the short wave- lengths. Further examples will be found in figs. 77 and 78. In this and in the preceding substance the emission bands are not so sharp as usual, which may be due to the greater molecular weight of the base. Porcelain (Pyrometer Tubing). (Hollow rod 15 by 2 mm. (hole 1 mm.). Energy supplied, watts. Fig. 69.) The sample of pyrometer tubing examined was heated to a light-red color (14000) to keep it conducting. The energy spectrum is marked for. Fig. 69. — Porcelain. its strong emission, with sharp maxima at , , , , , and ft, and with indications of bands beyond 6 ft. a hydrous aluminum silicate. Porcelain is made from Glass ("Soft Glass"). (Rod 3 by 2 mm., heated to dull red color. Curve a, fig. 70. Transmission, Carnegie Publication No. 65, p. 65.) The substance examined was a piece of ordinary "soft" white glass tubing, drawn into a solid rod. There are emission bands at 2, , , , and pt. Magnesia (Pyrometer Tubing). (Hollow rod, 12 by mm. (hole 1 mm.). Energy supplied, watts. Curve b, fig. 70.) This material is used to insulate thermo-couples, and conducts only at high temperatures. It is probably a mixture of magnesium oxide (see fig. 80) and silica. The temperature was probably 12000 to 14000. The. 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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