(8)
the Water is forced up to any Height or Place required.
Besides these four Forcers, there are four more placed at the other Ends of the Libræ, or Levers (not shewn here to avoid Confusion, but to be seen on the left Hand) the Rods being fixed at a 1, 2, 3, 4, working in four such Cylinders, with their Parts d d, &c. e e, f, g g, and i, as before described, standing near k k.
At the other End of the Wheel (at B) is placed all the same Sort of Work as at the End A is described, viz.
| The Cog-Wheel | I. | The four Levers ac, ac, &c. |
| The Trundle | K. | 8 forcing Rods a d, a d, &c. |
| The Spindle | X. | 8 Cylinders d e, d e, &c. |
| The Crank | Y, Z. | 4 Trunks, such as e e, h h. |
| The ſucking Pipes | f. | 2 forcing Pipes, as i. |
So that one single Wheel works 16 Pumps.
All which Work could not be drawn in one perspective View, without making it very much confused.
A Calculation of the Quantity of Water raised by
the Engines at London-Bridge.
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In the 1st Arch next the City is one Wheel with double Work of 16 Forcers.
In the 3d Arch
1st Wheel double Work at one End, and single at the other 12
2d Wheel in the Middle 8
3d Wheel 16
In all 52 Forcers.
