Tables 325-326. 

 TABLE 325. — Index of Refraction of Glass. 



277 



Indices of refraction of optical glass made at the Bureau of Standards. Correct probably to 0.00001. The com- 

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

 the finished glass. 



TABLE 326. — Dispersion of Glasses of Table 325. 



Smithsonian Tables. 



