Abstract
The reflecting power of quartz and marble in the crystalline form was determined for the spectral band of 80μ–150μ emitted by the Welsbach mantle. These materials were then powdered and the specular component of the radiation reflected from them was obtained as a function of the particle size and the pressure applied to them. The “Focal Isolation” method set-up for reflection measurements was employed.
© 1934 Optical Society of America
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