C 101 ) 
touching the Pulley at will make an Angle with 
C and again be fubjed to the Inconveniency above* 
mentioned. Bcfides, in bringing the End of theGibbet 
from g to 4, the Rope immediately applying itfelf to the 
Pulley at t will come forward with a Jerk, though 
it will be twitch’d back again when at 5*. 
If the Pulley be fet backwardcr dill, as may be 
fecn at P, when you wou’d k*eep the Weight under 
8, it will tend to go on towards r, in Proportion as the 
Rope at ;;; 8 is now ihorter than the Line n 8 ^ for 
now the Weight defeending a little, the Force of that 
Defcent added to the Pull of him who draws the 
Guide Rope, will caufe the Weight to fwing towards 
the Crane, fo as fometimes to do Mifchiefi if the 
Weight be very great, and the Men carelefs. 
N. jB. No Polition of the Pullies can mend the 
Matter, there being only three Situations of the Gib- 
bet in its whole Traverfe, where it can keep its Place 
when loaded. Therefore the Wheel, jy, and the 
Wheel and Pinion, x //, in F/g. i. are of very con- 
fiderable Ufe when great Weights are rais’d. 
Fig, 4. Reprefents the double Axis in Peritrochio, 
or Wheel and Pinion usM inflead of the walking Wheel 
of Fig, 7. 
' An Axis with Handles having a Pinion P 
which leads the Wheel P R to wind the Rope R Z on 
the Axel R. 
K, A, Part of the Catch which flops the Rope from 
running back again. 
W a wooden Wheel of fome Thicknefs, which 
( when the Catch is up ) is kept from turning too 
fwift as the Weight runs down, by pulling up the Se- 
micircular Part of the Pall 1 0 1 fo as to make it bear 
hard 
