CHEMICAL APPARATUS. 



77 



bladder apparatus. It consists of a bell-glass, furnished 

 with a brass cap and stop-cock, and a small connecting piece 

 with two female screws, by means of which a second stop- 

 cock, affixed to a bladder, or to any other vessel, may be 

 connected with the stop-cock and the receiver. If the 

 bladder has been previously compressed, and a communica- 

 tion be then made with the bell-glass by opening both stop- 

 cocks, the gas contained in the bell-glass may of course be 

 transferred into the bladder ; by pressing down the bell- 

 glass into the water of the pneumatic trough, the gas will 

 be forced up into the bladder ; the stop-cocks being then 

 shut, the bladder must be removed. 



Fig. 525. 



Fig. 526. 



The above cut (Fig. 526) re- 

 presents a brass tobacco-pipe, 

 furnished with a stop-cock, that 

 it may be connected with a blad- 

 der for throwing up soap-bub- 

 bles, filled with hydrogen gas, or 

 with a mixture of hydrogen and 

 oxygen gas, for explosion. Blow 

 some soap bubbles, filling them 

 from the bladder of hydrogen, 

 furnished with a brass pipe ; they 

 will ascend rapidly to the ceil- 

 ing ; if they are intercepted in 

 their course by a lighted candle, 

 they will explode with a dull 

 report, and a flash of yellow light. A jet is also con- 

 nected with the apparatus, by which a small stream of 

 hydrogen gas may be burned, and by holding a glass tube 

 about two feet long over the flame, musical sounds will be 

 produced by the vibration of the tube, which may be varied 

 as the tube is raised or depressed. 



Price, with jet, pipe, and gas bag, quart, $3.75. 



half gall., $4.00. 

 gallon, $4.25. 

 7* 



