. Selective radiation from various solids . t and ^, respectively. 4. Orthoclase ^ (Var. Adularia) {K Al Si^ Og).—[Rod, 8x2 supplied, and watts.] This substance emitted alittle more light than albite, although it was more emission band at 2/x is prominent. The one at is shiftedfrom its position at in the absorption spectrum, from whichit would appear that the group of atoms causing the absorptionis different in the two cases. An examination of the transmissionspectrum, using polarized light, will be necessary to determine thetrue position
. Selective radiation from various solids . t and ^, respectively. 4. Orthoclase ^ (Var. Adularia) {K Al Si^ Og).—[Rod, 8x2 supplied, and watts.] This substance emitted alittle more light than albite, although it was more emission band at 2/x is prominent. The one at is shiftedfrom its position at in the absorption spectrum, from whichit would appear that the group of atoms causing the absorptionis different in the two cases. An examination of the transmissionspectrum, using polarized light, will be necessary to determine thetrue position of the absorption band. The bands at and ^^^are in common with the feldspars. 5. Beryl {Be^ AQ {Si O^^.—[Rod, 10 X 3 mm. Energy, 7 to8 watts. Curve a. Fig. 4.] The rod was an opalescent, milkyglass, although the original crystal was a transparent green. The ^ Transmission curves. Carnegie Publication, No. 65, p. 65.^ Transmission curves. Carnegie Publication, No. 65, p. 64. CobZeniz.] Selective Radiation from Various Solids. 167. i68 Bulletin of the Bureau of Standards. [ Vol. 5, No. 2. apparent temperature was probably about iioo°. The emissionspectrum is unusual in appearance, with a sharp maximum super-posed upon it at There appear to be other ill-definedmaxima at , , (?), , , and ;t, respectively. 6. Rutile}^ {Ti 0^.—[Flat plate, 8 mm long, tapering from mm wide and .25 mm thick. Energy supplied, 6 6, Fig. 4.] This mineral was heated to a light red color 50 ,30 20 10 % i Fig. 4. (a) Beryl, Bes AI3 (Si 03)5 (b) Rutile, Ti O2 / \ t I V^ \ / ^ \ 1/ \ \ A y 1 \ xrVv 1 s^ \ \ 1 \ \ 1 V \N ^ / \ ^ 3 4 5 WAVE LENGTH 8/i corresponding to a temperature of perhaps 1000°. The terminalswere of copper melted to the rutile plate. The emission spectrumshows maxima at , , , and The transmission spec-trum is too low to show these as absorption bands; but the bandat is visible in the transmission spectru
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