C ] 
towards the well reducing of Fra&ures, &c. It con. - 
fifts of no more than a Wheel and Pinion, with their 
Axles 5 the Roch, or fnagged Wheel, being herein 
accounted as Part of the great Wheel, fixed in a light 
Frame of about Two Feet long, [ fee Fig. 2. Tab. II ] 
the Whole not exceeding the Weight of 15 Pounds; 
and when taken to Pieces, by unfcrewing the Frame- 
pieces, may be packed up in a common Rufh-Basket, 
belted to the Side, and conveyed to any Difiance. 
Again, the Room it takes up in working is not a 
full Yard, and may be fet up and fixed for Ufe in a 
few Minutes. In ufing this Machine, the Surgeon 
need but one Afliftant ; whereas, in moft other Me- 
thods, their Number is moft troublefome and incon- 
venient : The Bufinefs of this Afliftant is no farther 
than to mind the Surgeon’s Orders, and move the 
Winch according to his Dire&ion. When the Ex- 
tenfion is fufficient, the Engine flays itfelf, and con- 
tinues the Tenfion of the Limb, by the Afliftance of 
this Roch, or toothed Wheel, whofeTeeth are cut fine 
enough to flay the Engine at every Line of an Inch, 
and which is fixed on the Back of the aforefaid great 
Wheel, both to the Crofs by the Help of Screws, 
and on its Arbor by having its Centre fquared out, 
fo as to fix tight thereon, and fo near the Frame as 
only to allow a bare clearidge: Its Teeth, (landing 
counter to the former, admit the Spring or Catch 
fixed on the Infide of the Frame, to flip over the 
Vertex thereof, without Interruption 5 but in a reverfe 
Rotation, or when the Engine is about to come up, 
flies into the Spaces thereof, and flays the fame : T he 
upper Part thereof projects about an Inch from the 
Frame, fo that being prefled upon by the Finger of 
D d d d one 
