144 DUPLEX OR EITHER-SIDE LATHE. 



The working drawing, No. 1, is of the full 

 size ; No. 2, showing the plan of the treadles, &c., 

 is to a scale of six inches to a foot. I have great 

 pleasure in presenting these drawings to the Society, 

 so that any gentleman who may wish to adopt the 

 invention in his work-room or in his operating room, 

 can have tracings made from them for the instruc- 

 tion of the machinist whom he may employ to 

 make it. 



It will be perceived at once, upon an inspection 

 of the drawings, that the novel and leading feature 

 as to construction is, that the headstock, instead of 

 STANDING UPON and being fixed to a bench or table 

 a little to the left-hand, is suspended directly over 

 the centre of the little table, by an iron bridge 

 which stands at right angles with the mandril. In 

 order to save space, the mandril carrying the 

 corundum wheels is represented, in this drawing, as 

 occupying the same plane as the bridge that sup- 

 ports it : the proper working position, however, of 

 these parts with respect to each other is at right 

 angles. 



The headstock is made to carry two coarse co- 

 rundum wheels and a point on one side, and two finer 

 corundum wheels and a point on the other side, 

 and is capable, by the handle above the bridge, of 

 being turned half-way round in a horizontal plane, 

 so that either side of ifc, with its wheels and point, 

 may be brought to the right hand, and so into the 

 proper position for use. 



