TABLE 278.— COMPRESSIBILITY OF GLASSES 90 289 



AV/V 



1,6 Bridgman, P. W., Proc. Amer. Acad. Arts and Sci., vol. 73, p. 74, 1938. 



* Glass A is a potash lead silicate of very high lead content. t Glass C is a soda potash lime 



silicate. $ Glass D is a lead zinc borosilicate. 



TABLE 279.— SPECIFIC GRAVITIES CORRESPONDING TO THE BAUME SCALE 



The specific gravities are for 15.56°C (60°F) referred to water at the same temperature 

 as unity. For specific gravities less than unity the values are calculated from the formula : 



t, 140 



SMITHSONIAN PHYSICAL TABLES 



