524 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



introduction of the machine in private houses. The acid may 

 be removed and replenished when necessary by means of a 

 suitable opening provided on one end of the receiver. When 

 the acid is fresh, the freezing operation is much more rapid 

 than when a number of carafes have been frozen, a natural 

 consequence of the weakening of the acid by dilution from 

 the absorbed vapor. When the efficiency of the acid has be- 

 come notably impaired, it must be removed and replaced by 

 fresh material. The cost of freezing a single carafe is esti- 

 mated to averasje about one half to two thirds of a cent 

 where the acid is thrown away after its work is performed ; 

 where the diluted acid can be utilized, this estimate will of 

 course be materially lessened. The carafe, or decanter, half 

 filled with ice, is to be completely filled with water, and is 

 thus brought upon the table, being replenished with fresh 

 water when empty. The shape of the decanter renders the 

 melting a slow process, and when once partially filled with 

 ice it will supply cold water for the greater part of the day. 

 If desired, however, it is obvious that the same machine, with 

 a suitable modification of the water-vessels, can be made to 

 furnish ice blocks of any size or form. American Exchange 

 and Bevieiv, XXVII., 272. 



