AIR PUMPS AND APPARATUS. 



199 



into the bottle, which rising through the water, will by its 

 density press strongly on the surface of that liquid ; then 

 after turning the stop-cock the syringe is to be removed, 

 and a small jet-pipe being fitted to the tube, the stop-cock 

 is to be opened, and the elasticity of the condensed air in 

 the bottle, will drive up the liquid in a jet. 



Price, $10.00. 



" revolving jet, $2.00. 



Air Condensing Apparatus, with Fi s- 186 - 



Copper Chamber. (Fig. 186.) 

 This condensing apparatus consists 

 of a brass condensing pump or 

 syringe, nine inches long, and one 

 and a half inch diameter. A cop- 

 per chamber or vessel for contain- 

 ing the air, having a stop -cock 

 with screws on the top, with a 

 tube descending nearly to the 

 bottom, and also a stop -cock on 

 the side near the top, there being 

 a tube connected with this aper- 

 ture descending nearly to the bot- 

 tom. To the stop-cocks are at- 

 tached several jets ; a straight jet, 

 a compound jet, and a revolving 

 jet. To use this apparatus fill 

 the chamber about half full of 

 water and screw on the stop -cock, 

 connect the condensing pump, 

 and condense the air therein, then 

 turn the stop-cock to confine the 

 air, and removing the pump, screw on the straight jet ; on 

 turning the cock, the pressure of the air within the chamber 

 will force the water out in a stream with great force. If 

 the compound jet be used, it will produce a great number 

 of streams, and pour out with great beauty. Also the re- 

 volving jet will form a pleasjng circle in the air, as the water 

 is rapidly forced out. All these jets may also be used on 

 the stop-cock at the side of the chamber. 



The long brass cylinder, or gun-barrel, represented in the 

 cut, and having a screw fitting the stop -cocks, is designed 

 to illustrate the air gun. To use, screw the barrel to the 



