TABLES 325-326. 



TABLE 325. Index of Refraction of Glass. 



Indices of refraction of optical glass made at the Bureau of Standards. 



277 



nces o reraction of optical glass made at the Bureau of Standards. Correct probably to o ooooi The com 

 position given refers to the raw material which went into the melts and does not therefore refer to the comoosition of 

 the finished glass. 



TABLE 326. Dispersion of Glasses of Table 325. 



SMITHSONIAN TABLES. 



