555 



TABLE 588.— PERCENTAGE DIFFUSE REFLECTION FROM MISCELLANEOUS 



SUBSTANCES 



TABLE 589.— INFRARED REFLECTIVITY OF TUNGSTEN 

 (Temperature variation) 



Three tungsten mirrors were used — a polished Coolidge X-ray target and two polished 

 flattened wires mounted in evacuated soft-glass bulbs with terminals for heating electrically. 

 Weniger and Pfund, Journ. Franklin Inst. 



TABLE 590.— RESTRAHLUNG BANDS FROM VARIOUS MATERIALS 174 



(percent) 



174 Strong, Phys. Rev., vol. 38, p. 1818, 1931. 



* The use of a paraffin window about 3 mm thick stops the short wavelength restrahlung of quartz at 

 3.7,n and of calcite at 6.7/1. Weak reflection at 41/t. 



SMITHSONIAN PHYSICAL TABLES 



