318 



Improved Syphons. 



portion of about three or four inches in length, is left free, so that 

 advantage may be taken of its flexibility, to bend it into a situation 

 convenient for applying the lips to the orifice. About the cork, the 

 neck of a stout gum elastic bag is tied air tight. The joinings of the 

 tubes with the cork, must also be air tight. The lower half of the 

 gum elastic bag is removed, as represented. 



Fig. 1. 



Fig. 2. 



In order to put this syphon into operation, a bottle must be used, 

 having a neck and a mouth of such dimensions as to form an air tight 

 juncture with the bag when pressed into it. This object being ac- 

 complished, the air must be inhaled from the bottle, until the dimi- 

 nution of pressure causes the liquid to come over, and fill the syphon„ 

 After this, on releasing the neck of the bottle, the current continues, 

 as when established in any other way. 



Fig. 2, represents the more complete construction. In this are 

 two metal tubes, passing through perforations made for them in a 



