Apparatus for Solidifying Carbonic Add. 



299 



ing IP a single revolution in the opposite direction, the shoulder 

 of G is brought firmly against the bottom of E, so that no es- 

 cape is permitted directly upward, but only in a lateral direction 

 through the brass tube L, which connects the generator with the 

 receiver C. A washer of sheet lead should be placed around the 

 shoulder of G, in order to secure a perfect metallic contact be- 

 tween it and the bottom of E. 



The receiver C is made of the best boiler iron, which was 

 strongly welded around a cylinder and a bottom also welded in. 

 It is of the same height as the generator, which is about one foot, 

 but only about two inches in diameter internally, and has a capa- 

 city of about one pint. This form enables it to resist much 

 greater pressure than if it was of a larger diameter ; and it is 

 rather an advantage than otherwise to have it of the same length 

 as the generator. 



