C w- 3 
B , is fomewhat rounded off at its End, in order to 
insinuate itfclf the better under the Arm pit. On this 
bigger Extremity is a fort of Spur ot Tenant, T, TAB. 
111. the upper Part of which is joined to the Lever by 
Two Iron Pins, fo that, upon taking out the Pins, the 
Spur comes out, and feparates itfclf from the Lever, 
as appears by Fig. 4. TAB. III. It was necettary to 
make this Spur moveable, and give it the Figure of a 
Jfquare Rule in which it appears, in order to bring it 
quite clofe to the End of the Lever, or fet it back, 
according as it may be necettary. For this Reafon the 
tipper Part of this Spur a, b 7 Aides along in a Mortifc 
or Groove of the Length of one Foot contrived under 
the Lever, beginning from its Extremity B , to which 
anfwers the Shoulder of the Spur. 
The reft of the Tenant, or its principal Parte, is 
fitted to enter into the Mortifc A, which is the upper- 
moft Part of theFoot,Fig. 2, 3. TAB. IIL They arc both 
of them pierced with a Row of Holes, through one of 
which one muft run an Iron Pin, to unite them, and 
to form the Point of Reft, or the Hinge of the Lever. 
Towards the other Extremity A of the Lever, there 
is a Piece of Iron C, made Arch-wife, under which 
paftes the elaftic Tail B> 7 fy of the Rod fattened to 
the Sliding-piece F, G, and into which catch Teeth 
made on the faid Tail, as is feen in TAB. III. and IV. 
This Iron Archought to be very folid, becaufe itkeeps 
down the Arm, and fupports all the Effort of the 
Lever. I will give to the Sliding-piece F, G , which 
is fitted to the Lever, the Name of the Bracer j it is 
a Groove made of one Piece of Wood, reprefented 
in its Situation in TAB. II. and IV. This Piece is 
hollow in the upper Surface, as is juft now faid, to 
place 
