Page:Philosophical Transactions - Volume 037.djvu/12

 six 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 respective Libra, or Lever, a 1, 2, 3, 4, within three Foot of the End. These Levers are 24 Feet long, moving on Centers in the Frame b b b b; at the End of which, at c 1, 2, 3, 4, are jointed four Rods with their forcing Plugs working into d 1, 2, 3, 4, four Cast Iron Cylinders four Feet three quarters long, seven Inches Bore above, and nine below where the Valves lie, fastened by skrewed Flanches, over the four Holes of a hollow Trunk of Cast Iron, having four Valves in it just over e e e e, at the joining on of the Bottom of the Barrels, or Cylinders, and at one End a sucking Pipe and Grate f, going into the Water, which supplies all the four Cylinders alternately.

From the lower Part of the Cylinders d1, d2, d3, d4, come out Necks turning upward Arch-wise, as g g g g, whose upper Parts are cast with Flanches to skrew up to the Trunk h h h h; 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 cast with four Bosses, or Protuberances, standing out against the Valves to give room for their opening and shutting; and on the upper Side are four Holes stopped with Plugs, to take out on Occasion, to cleanse the Valves. One End of this Trunk is stopped by a Plug i. To the other, Iron Pipes are joined, as i 2, by Flanches, through which Rh