Improved Galvanometer. 



359 



By means of a treadle T, the rod R, and platform P, the bot- 

 tle is, by the foot, pressed against a brass disk D, coated with gum 

 elastic. In the centre of this disk are two holes, one of which re* 

 ceives a leaden tube communicating with an exhausting syringe S, 

 while into the other hole another tube is soldered, which extends to 

 the bottom of an adjoining carboy of sulphuric acid. By means of 

 the syringe, the bottle being exhausted, the contents of the carboy 

 are forced into it by atmospheric pressure. 



The gum elastic being stretched over the disk, is secured by a 

 clasp which is fastened round the periphery by a screw. 



This apparatus may be employed to raise liquors into a barroom, 

 from casks in a cellar, with this advantage over the pump now used 

 for that purpose; that the liquor does not pass through a pump. It 

 has only to come into contact with a pipe of from one fourth to three 

 eighths of an inch in bore. 



o 



The attachment to the cask is easily made by a gallows screw sol- 

 dered to the nozzle of a cock, or simply to a ferule which may be 

 driven into a cork hole, punching the cork before it. 



The foaming of fermented liquors would be promoted by the ex- 

 haustion, lessening, for a time the atmospheric pressure on the car- 

 bonic acid. 



3. Improved Galvanometer or Multiplier, of an unusually large size. 



This engraving represents a large multiplier, or galvanometer, 



