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Fig. I. Reprefenting a fix’d Crane with a Gibbet 
moving on an upright Shaft or Axis. 
D ^ preferve the 
^ Weather, when- the Arm of the 
Gibbet V Gg .being turn’d towards Y is brought 
under it. . , ^ 
^ of the Crane, is an hori- 
zontal Situation, call’d the Plate of the Crane, . 
' X> Y, Z, The three. Crane Pofts brac’d* at Ton and 
Bottom. ^ 
D S, M N, IE, Three Cills within the Stone Work 
brac’d with Wood, and -made fait with an upright 
Plate of.dron pinn’d to the Wood on each Side. 
•NxB. When the Crane is not in Stone Work^ the 
three Cills mujl he all in one Piece, reaching from 
H I, h E, Are'the Braces of the main Poft of the 
Crane, which come up^above the Level' of the .Wharf 
L TO B, which are longer and’ ftronger than the .others. 
Here a crofs Piece 'whofe Seftion is (&') keeps the 
mam Polt from twifting. ' , 
t R C, The Capftane, or Shaft of the Crane to re- 
ceive the Rope or Chain ; which Shaft is turn’d here 
by Bars or Handfpikes, fuch z&ld, fd, or^^, the 
lower Part being ftrengthened with Iron Hoops above 
and below tlie Holes at d, with a Pivot or Iron 
Axis turning in an Hole in a Piece whofe Seftion 
JSF. .c M. , .. 
p p. Are two Pin?, which hold on., a rnll,.- in 
which the upper Part of the Shaft turns. 
CB, 
