( 7 ) 
fix Inches Diameter, each having a Slit in the Ends, 
where an Iron Wedge is put, one half into the End X, 
the other half into Y, by Means of which the Axis X 
turns about the Crank Z Z, 
The four Necks of the Crank have each an Iron 
Spear, or Rod, fixed at their upper Ends to the re- 
fpeftive Libra, or Lever, a i, 2, 3, 4, within three 
Foot of the End. Thefe Levers are 14 Feet long, mo- 
ving on Centers in the Frame b b b b ; at the End of 
which, at c 1, 3, 4, are jointed four Rods with their 
forcing Plugs working into d 1, a, 3, 4, four Caft iron 
Cylinders four Feet three quarters long, feven Inches 
Bore above, and nine below where the Valves lie, fa- 
ttened by skrewed Flanches, over the four Holes of a 
hollow Trunk of Caft Iron, having four Valves in it 
juft over e e e e, at the joining on of the Bottom of 
the Barrels, or Cylinders, and at one End a fucking 
Pipe and Grate/, going into the Water, which fupplies 
all the four Cylinders alternately. 
From the lower Part of the Cylinders d 1, d x, d s t 
d 4, come out Necks turning upward Arch-wife, as 
g g g g, whofe upper Parts are caft with Flanches to 
skrew up to the Trunk hbh b\ which Necks have 
Bores of 7 Inches Diameter, and Holes in the Trunk 
above communicating with them, at which Joining are 
placed four Valves. The Trunk is caft with four BolTes, 
or Protuberances, Handing out againft the Valves to 
give room for their opening and (hutting; and on the 
upper Side are four Holes flopped with Plugs, to take 
out on Occafion, to cleanfe the Valves. One End of 
this Trunk is flopped by a Plug i. To the other. Iron 
Pipes are. joined, as i z, by Flanches, through which 
