( 20 ? ) 
hard againft the Wheel below, to regulate or flop the 
Defcent of the Weight. 
C C, The Pivots or Centers of the Axel. 
L F, Part of the Leaver, whereby the Pall is 
drawn up againft the Wheel W w, by means of the 
Rope F B. 
CLj The Weight to bring down the Pall clear of 
the Wheel W w, when it is not pull’d up. 
I o I B, The End of the Pall which is applied to 
the Wheel, the other End not being reprefented here. 
5*. Shews the Manner of letting down the 
Weight fwifter or flower as there is Occafion, repre- 
fenting that End of the Axel on which the Catch and 
Pall ad alternately. 
P P and are two upright Pieces fix’d to the 
Frame of the Crane, in any manner that is mod 
convenient for carrying the three Centers L, K, and L 
When the Rope R r Z going over a Pulley at r, or 
any where elfe, draws from the Axel in the Diredion 
R r ; the Catch, if its End is at A, keeps it immove* 
able. But by pulling at H, the Leaver GF rifes at 
F, and confequently draws up the End B of the Pall 
B D ; which moving on the Center /t, does by its End 
D ( by means of the Bar D E) pull down E, and raife 
A of the Catch, fo as.to let the Rope run down*, but 
to prevent its running too fad, one mud pull a little 
harder^ then the Semicircle I o'l will prefs againd the 
Wheel, and flacken the Defcent of the Weight; which 
will be wholly dopp’d by pulling dill harder: Then the 
Leaver, Pall, and Catch will be in the Pofition mark’d 
by prick’d Lines and fmall Letters. Now if the Per- 
fon holding H, Ihou’d carelefly let it go, the Weight 
Q. in defending will bring down the Pall at B, and 
E e z raife 
