CHEMICAL APPARATUS. 



107 



The three figures (Nos. 578, 579, and 580) represent the 

 usual disposition of apparatus employed in preparing, drying, 

 and transmitting gaseous substances over any subject of 

 experiment, when the apparatus requires much care and 

 attention. 



Fig. 57* 



(Fig. 578, as above), A, represents bottles, flasks, or re- 

 torts, for producing the gas required; B, a long funnel for 

 introducing acid in small successive quantities, or any other 

 liquid that may be required ; c D, balls for intercepting any 

 portion of fluid which may be mechanically suspended in the 

 gas escaping from the bottle ; G, the tube filled with frag- 

 ments of chloride of calcium for drying the gas ; F, caout- 

 chouc connectors ; x, wooden stands for supporting the 

 apparatus. 



Fig. 57i). 



In Fig. 579, the gas is made to act upon I. The assay 

 is often placed in tubes, as G. This figure illustrates the 



