118 TRANSACTIONS OF THE 



Stephens^ Pivoting Universal and Jeweling Lathe^for Watchmakers. 

 G. M. Bodine, agent, 22 Maiden Lane, New-York. 



" This is one of the most complete lathes for watchmakers ever 

 offered to the trade. It combines in one instrument all that is 

 useful or desirable in the lathe way, and is adapted f )r doing the 

 work of a universal jeweling and pivot lathe; the graver for 

 turning pivots being held in the Slide Rest, instead of the hand. 

 It is strong, and not liable to get deranged, and so simple that any 

 ordinary Avorkman can turn the smallest pivots as perfectly as the 

 most experienced workman by the old method. Pivots can be 

 turned with a graver held in the hand, as on the ordinary lathes, 

 when desired. 



" The end of the Mandril has an inside and outside screw; the 



outside screw is for the Pivot Chuck and Universal Head; the 



nside can be used for ordinary job work and small turning, and 



a variety of Chucks may be fitted to facilitate the finishing work. 



" The Slide Rest is on an entirely new principle, combining unu- 

 sual strength and firmness with great simplicity. The traversing 

 part moves on an arc, and rises as you cut from the centre. 



" C is a cylindrical bar, projecting six inches beyond the Head, 

 on which the Slide Rest and common turning rest T moves. 



" D is a cylinder, with socket, to receive cutters for turning and 

 jeweling; also centres for uprighting and turning, from two cen- 

 tres, moved back and forth by the large screw at the end. 



" E is a cutter for turning pivots, in its place in the socket. 



" P is a reciprocating screw, carrying the cutters to and from 

 the centre. 



" Fig. 2, is a Chuck for turning pivots, having a screw cut 

 inside of the shaft, to fit a corresponding screw on the Mandril of 

 the lathe, and has a part removed, to show the position of the 

 back centre H, with a wheel and pmion chucked for turning. 



" H is a back centre, with a conical hole to receive the end of 

 a pinion, and is fitted so as always to present a true centre, and is 

 sujD&ciently tight to retain its position in moving back and forth, 

 to accommodate the different lengths of pinions. 



