216 



Transactions of the American Institute. 



about one minute. "We dissolve the contents of this tin box (bicar- 

 bonate of soda) in water and pour it into the extinguisher, then fill 

 the extinguisher with water to within three inches of top. We now 

 pour the contents of this glass bottle (acid) into the leaden bucket,' 

 put in the lead stopper firmly, insert the bucket in the extinguisher 

 and screw down the cap hard and tight. In case of fire, pull up the 

 handle H, this draws out the stopper 0,'and the bucket A, turns 

 bottom side up, as shown by dotted lines E, being only supported 

 after the stopper is withdrawn by pivots at P P, thus discharging its 

 contents into the carbonated water. Instantaneous chemical action 

 takes place, supplying 100 pounds pressure to the square inch to throw 

 the stream, and securing perfect readiness to play upon the fire in a 

 few seconds of time. 



