372 APPLICATION OF HYDEAULIC PRESS 



remove it as I suspected what would follow; 

 but I could not obtain ber consent, so I merely 

 filled it witb amalgam. 



The point on wbicb I wish to have the opinion 

 of tbe Society is tbis : — Is tbe extracted tootb a 

 dens sapientice, or a second molar ? I bope to 

 obtain another cast of the mouth when tbe coming 

 tootb has attained its maturity, which will be 

 necessary to complete the case. 



The following oommunication was read from Mr. Fox, of Gloucester, 

 *' 0?i the application of an Hydraulic Press for swaging Gold Plates :^' — 



Gentlemen, — For a long time past I have been 

 convinced that the practice now in use among 

 dentists for obtaining a correct plate is open to 

 many objections. The ordinary practice of striking 

 up by a sudden blow frequently injures the die, 

 whether of zinc or of any other material now in 

 use, and also cracks the gold. 



To show this is the case : in all other branches 

 of manufacture in which a plate is driven up 

 between two dies, squeezing has been substituted 

 for striking. This squeezing is sometimes per- 

 formed through the means of a powerful screw, 

 but now more usually obtained by the wonderful 

 ease of the hydraulic press. 



To mention a familiar example : the beauti- 

 fully raised curtain-plates, and the finger-plates 

 for doors, are all stamped by pressure and not by 

 a sudden strike. 



