2-r Strokes, 
( 9 ) 
One Revolution of a Wheel makes in 
every Forcer 
So that one Turn of the 4 Wheels makes 1 14 Strokes. 
When the River is at bell, the Wheels go 3 
fix times round in a Minute, and but y'i> 6 
at middle Water - - — > 3 
The Number of Strokes in a Minute 684 
The Stroke is xi F eet,in a 7 Inch Bore,raifes 3 7 Ale 
They raife per Minute 205 2$ Gall. 
That is, 113120 Gallons = 19^4 Hog(heads^>er Hour, 
and at the Rate of 46896 Hoglheads in a Day, to 
the Height of 120 Feet. 
This is the utmoft Quantity they can raife, fup- 
pofing there were no Imperfedions or Lofs at all. 
But it is certain from the Confederations follow- 
ing , that no Engine can raife fo much as will anfwer 
the Quantity of Water the Cylinder contains in the 
Length of the Forcer , or Pif oil’s Motion : For, 
Firjl, The opening and ihutting of the Valves lofe 
nearly fo much of that Column, as the Height they 
rife and fall. 
Secondly , No Leather is ftrong enough for the Pi- 
fton, but there muft continually flip or fqueeze by fome 
Water, when it is raifed to a great Height j and when 
the Column is fliort, it will not prefs the Leather 
enough to the Cylinder, or Barrel : But efpecially at 
the Beginning, or firft moving of the Pifton, there is 
fo little Weight on it, that before the Leather can ex- 
pand, there is fome Lofs. 
Thirdly , And this Lofs is more or lefs, as the Pi- 
ftons are loofer or ftraighter leathered. 
Fourthly , When the Leathers grow too foft, they 
are not capable of fuftaining the Pillar to be raifed. 
B Fifthly , 
