244 



This geuerator's claim to superiority is bastnl on its simplicity of 

 structure, its inexpeusiveiiess and its ease of oi>eration. All the special 

 apparatus required is a bowl-shaped member, attached to an upright rod, 

 the bowl being perforated. This can be made any size desired, but should 

 be of some material which will resist chemical action, preferably glass. 

 This can be used with a vessel constructed especially for the puriwse, or 

 with an ordinary wide-mouthed flask or bottle. 



In use, the rod extends through one of the holes in an ordinary rub- 

 ber stopper. Through the other hole is the tube furnishing an outlet for 

 the gas. The acid or other liquid is put in the bottle or flask receptacle 

 and the solid is placed in the bowl-shaped member. Now when a quantity 

 of gas is desired, by pressing downward on the rod, the bowl with its 

 solids will be lowered into the liquid and the chemical action will begin. 

 When a sufficient amount of the gas has been obtained, by raising the 

 bowl out of the liquid the action will be stopped, as the acid will run out 

 through the perforation in the bowl. This will save the unused chem- 

 icals and prevent the escape of the poisonous and obnoxious gas. As a 

 still further safeguard, the bowl can \ye constructed with a projection on 

 it, this projection having a concave depression ; this will be arranged in 

 such a way that when the Innvl-shaped member is lifted from the liquid, 

 this depression will fit over the outlet for the gas and completely shut off 

 the escape. 



The principle of the generator will be made clear by an examination 

 of the accompanying drawing. 



Moorcfi Hill, ludiunn. 



