Tables 527 (continued) and 528 

 DIELECTRIC CONSTANT 



TABLE 527 (continued)- — Dielectric Constant of Solids 



447 



TABLE 528. — Dielectric Constant of Crystals 

 Da, D/3, D7 are the dielectric constants along the brachy, macro and vertical axes respectively. 



Substance. 



Uniaxial : 

 Apatite . 

 Beryl . . , 



Calcite . . 



Dolomite 

 Iceland spar 

 Quartz . . 



Ruby (Siam) 

 Rutile (TiC 2 ) 

 Tourmaline . 



Zircon . . 



Wave- 

 length, 

 cm. 



75 



75 



75 

 75 



7S 



CO 



75 

 75 



Diel. const. 



9.50 



7-85 

 7.10 

 6.05 



8.49 

 8.78 

 7.80 

 8.50 

 4.69 



4-38 

 4.27 



13-3 

 89 

 7-1.3 



6-75 

 12.8 



7.40 



7-44 

 6.05 



5-5 2 



7-5 6 

 8.29 

 6.80 

 8.00 

 5.06 

 4.46 

 4-34 

 n-3 

 i-73 

 6-54 

 5-65 

 12.6 



Substance. 



Rhombic : 

 Aragonite . . 



Barite . . . 



Celestite . . 

 Cerussite . . 

 MgS0 4 +7H 2 



K 2 S0 4 . . . 

 Rochelle salt* 

 Sulphur . . 



Topaz . . . 

 " colorless 



* See page 448. 



1 Schmidt, 1903. 



2 Starke, 1897. 



3 Curie, 1S89. 



4 Fallinger, 1902, 1919. 



5 v. Pirani, 1903. 



6 Ferry, 1897. 



7 Borel, 1893. 



8 Bolztmann, 1875. 



Smithsonian Tables. 



