Stroke of 24 Feet will rife, and by enlarging or 
diminilhing the fix’d Wallower, you obtain a Stroke 
of any required Height, even to the extent of the 
Atmolphere’s PreiTurc. By this great Advantage, 
the Water rifes freer, and with greater Velocity, 
and as the Lifters or Forcers rife and fall exaftly 
perpendicular, and with an equal continued Strain, 
and as the Bearings alfo are fewer and lighter, con- 
fequently the Fritftion in all thefe will be a great 
deal lefs than with the Crank, &c. And, Laftly, 
Seven Eights of that Water which is always loft 
by. the flow opening andfhutting of the Valves will 
be faved. 
From the above Confiderations, and by the 
many Experiments I have made on this Occafion, 
in order to know the real Difference between thefe 
different ways of Working, I find, that near twice 
the Quantity of Water will be raifed to the fame 
Height, in the fame Time, with the fame Power, 
by my Method, more than with the beft Crank- 
work that has ever been yet eretfted. 
HI. An 
l . • . 
