272 RELATION OF DECREMENTS TO 



Decrements on the terminal edges. 

 C, symbol of middle plane 1 

 C, general symbol . . J 



B, symbol of middle plane 1 

 B, general symbol . . J 



of class c. 



Decrements on the lateral edges. 

 1 G 1 symbol of middle plane "\ 

 'g p ; ; ; } other planes J of class 



1 H 1 . . . middle plane ~\ 

 *W '. '. '. } other planes 



The Oblique Rhombic Prism. 

 Fig. 317. 



Decrements on the acute solid angles. 



1. Simple and mixed decrements on the angle A, 



P 



The general symbol A, represents class c. 

 i 



A represents the middle plane of that class. 

 P A P represents part of the series of class d. 



