AIR PUMPS AND APPARATUS. 

 Fig. 181. 



197 



Pike's Improved Single Barrel Air Pump with raised 

 plate. This powerful and simple arrangement of the large 

 single barrel air pump, is represented in Fig. 184, as above. 

 The barrel is of brass, fourteen inches long and two inches 

 diameter, having a broad brass base, firmly bolted to the 

 frame by screws beneath. The piston is worked by standing 

 with the feet on the frame and grasping the handle with 

 both hands, by which means a much larger piston may be 



