DESCEIPTION OF A DUPLEX OE EITHEE- 

 SIDE LATHE FOE THE USE OF DEN- 

 TISTS, ETC. 



Read July 5th, 1857. 

 By GEORGE OWEN. 



{Presented by J. Tomes, P.R.S.) 



The contrivance of what I have called a duplex 

 or either-side lathe, has arisen out of the daily 

 experienced inconveniences which attach to the 

 foot-lathes hitherto used, for carrying the corundum 

 wheels, &c., used in fitting mineral blocks and teeth 

 to their golden or platina bases. 



It is intended to obviate the necessity which at 

 present exists for the frequent, not to say constant, 

 removal of the corundum wheels from the mandril, 

 when others of a finer or coarser kind or of a 

 different form are required. 



Another object gained by this invention is, 

 accommodation for two persons to work with the 

 same apparatus at the same time, standing on 

 opposite sides, one or both working the driving 

 wheel by a separate treadle, both treadles being 

 connected by a very simple arrangement with the 

 same crank. 



