170 



PROCEEDINGS OF SECTIOX B. 



pressure tubing, and I.R. corks are used in all the jars. Gaseous NHg 

 does not act rapidly on India rubber, although the solution acts very 

 quickly; hence siphons are better than openings in the base of the 

 jars for drawing off the solution. 



III. — A Rapid Form of Condenser for Distilled Water. 



This condenser was designed to give a rapid supply of distilled 

 water with a boiler fed with hot water from the top of the condenser. 



With the ordinary worm condenser, even of 1 in. diameter, if 

 the distillation was at all rapid, pressure was produced in the still, 

 and water was forced back through the bent pipe into the condensar- 

 tion vessel ; the worm did not present sufficient cooling surface to 

 rapidly condense all the steam. 



In this condenser, which is practically a reversed tubular 

 boiler, nine i in. tubes (tin) 1 ft. long form the condenser, thus pre- 

 senting a large condensing surface. 



1 V'i<''to WatCf 



Fig. 3 sufficiently explains the construction of the condenser. 

 The drums A and B are of copper, tinned inside, the tubes connecting 

 them are of tin, the outer vessel C is of copper. 



The only trouble experienced has been in the joints between the 

 tin tubes and the copper drums, but these can be readily soldered 

 again. 



The condenser will yield 7,000 cc.'s per hour without causing 

 back pressure in the boiler. With gas at is. per 1,000, the cost 

 is about 2d. per gallon, but no claim is made on the score of low cost; 

 this depends more upon the effective jacketing of the boiler. 



