[ 557 ] 
This Machine (fee Tab. IV. Fig. 2 ) which confifts 
of Two Boxes A, joined at the Ends by Two Hinges, 
contains, when folded together, every thing that can 
poffibly be wanted in the Operation before- men- 
tioned ; and it may fo eafily be made ufe of, without 
the Affiftance of any other Operator than the Surgeon 
employed, that I may venture to affirm, a Patient 
may be fet down, the Inftrument applied, and the 
Shoulder reduced, in One Minute, ordinarily lpeak- 
ing. 
The Length of this Inftrument, when {hut up, is 
One Foot Eight Inches, its Breadth Nine Inches, and 
Thicknefs Three Inches and a Quarter. When it is 
opened, it is kept fo by Two Hooks fixed on the 
Backfide of it ; and when one End of it (lands 
on the Ground, the other (lands high enough to be- 
come a Fulcrum , or Support of a Lever B B , which is 
fixed on a Roller b, by a large Wood Screw, which 
turning fideways as well as with the Rowler, it 
obtains a circumrotatory Motion, fo that it will ferve 
to reduce a Luxation either backward, forward, or 
downward. 
The Roller on which the Lever is fixed, is juft the 
Diameter of the Depth of one of the Boxes, into 
which are driven Two Iron Pins, the Ends of which 
are received by the Two Sides of the Box, which are 
an Inch thick. 
The Lever is Two Foot Four Inches, and is cut off 
and joined again by Two Hinges C, to fold up fo as 
to be contained in the Boxes. On the Backfide of it 
is a Hook, to keep it ftrait ; the other End of it is to 
hang over the Roller about an Inch and half, which 
is to be excavated and covered with Buff Leather, for 
the 
