TRANSMITTANCE OF NEAR‐INRARED ENERGY BY BINARY GLASSES*

Abstract

A bstract A study has been made of the transmittance of near‐infrared energy by a number of binary glasses. Of the systems studied, the lithia‐silica and lead oxide‐silica glasses were found to have the highest transmittance of energy in the range of wave lengths from 3.0 to 5.0 microns. The transmittance of lithia‐silica glass is compared with that of the other alkali‐silica glasses. Values of transmittance are given for lead silicate glasses of higher lead content than previously reported in the literature.