CASK-GAUGING. 



Casks are usually comprised under the following figures, 

 viz. : 



1. The middle frustum of a spheroid. 



2. The middle frustum of a parabolic spindle. 



3. The two equal frustums of a paraboloid. 



4. The two equal frustums of a cone. 



Their contents can be computed by the rules for ascer- 

 taining the contents of these figures. 



But in almost all ordinary casks the l>ilge or swell from 



