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this; becaufe there is none in which concur at once 
, fo much Force and Expedition, joined to fuch Sim- 
plicity, Regularity, and Safety, that are quite lingular. 
For that Method in which a Surgeon only employs 
his own Strength, and that of his AffiBants, is com- 
monly inefficient ; and the other, in which he helps 
himfelf with the Pulley, is perplexed with a great 
Apparatus , is long, and ffill very much wants the 
Hands of the Surgeon, and of his AffiBants : All which 
are CircumBances which render the Method more 
complicated, and lefs fure. 
Thefe are the Motives that have engaged me to 
contrive the new Ambe I herewith have the Honour 
to lay before the Society, in which I have endea- 
voured to re&ify all the Defe&s before-mentioned. 
A T)efcripUon of the new Ambc. 
Tab. II. The Bafts of the whole Machine is an 
Elbow-chair all of folid Wood, higher than others' 
ufually are, in order to give Room to the Lever to 
play the more freely, which cannot be lowered any 
farther than to the Floor on which the Elbow-chair 
Bands: To prevent any Uneaftnefs to the Patient 
from that Height of the Chair, it has a Foot-Bool 
that makes Part of the Chair, and brings the Seat to 
its ufual Height. 
Each Arm of the Chair is pierced with a round 
Hole, to receive the Stem or Foot of the Ambe. If 
the Luxation is on the Right Side, the Foot is run 
through on the fame Side, and vice verfa. The Pa- 
tient is tied partly to the Back of the Chair, partly 
to a Piece joined to the Chair on that Side where 
E e e the 
