[ 55 ® ] * 
the more cafy Reception of the Head of the Os 
hufnert. 
Two Iron Cheeks© T> are fcrewed on each Side of 
the Lever, to receive through them an Iron Roller 
E , which has Two Holes through it, to receive Two 
Cords coming from a Brace F , fixed on the lower 
Head of the Os humeri j for on no other Part of the 
Arm above the Cubit can a Bandage for this Purpofe 
be ufeful 5 for, if the Surgeon applies it on the mufcular 
Part of the Arm, it never fails flipping down to the 
Joint, before you can extend the Limb. 
The Iron Roller has a fquare End, on which is 
fixed a Wheel G, within the Cheek, notched round, 
which works as a Rotchet on a Spring Ketch under- 
neath the Lever, by which it is flopped, as you wind 
it with a Winch; and may at Pleafure be let loofe, 
as there fhali be Occafion for it, by difeharging the 
Ketch. 
I come now to deferibe the Brace F, which, com- 
pared with common Bandages, is of more Confe- 
quence than can eafily be imagined by unexperienced 
Perfons. It confifts of a large Piece of Buff Leather, 
big enough to embrace the Arm, fewed on Two 
Pieces of flrong Iron curved Plates, riveted together, 
one of them having an Eye at each End, to fallen 
Two Cords in; the other is bent at the Ends into 
Two Hooks, which are to receive the Cords, after 
they have crofied over the Arm above. 
In order to keep the Patient fleady in his Chair 
from coming forward, or letting the Scapula rife 
up, on deprefling the Lever, after the Limb is drawn 
forward by the Winch, there muft be fixed over the 
Shoulder a Girth with Two Hooks at the Ends of it, 
long 
