[ >55 ] 
fridtion that was in the pevets B, fig. 3. of the great 
axis, which was — 425 pound, is reduced to 
or fomewhat lefs than 2 4 pound. 
Upon trial, the leaver, that before required a power 
of 95 pound to overcome the leaf! refiftance from 
fridtion, was as eafily effected by the application of 
4 pound ; and the refiftance from fridtion occafioned 
by a weight of 6 tons is of fo little confequence, 
that the leaver may he fwung with a flight thread, 
and will continue in a ftate of vibration for feveral mi- 
nutes after. 
The original quantity of fridtion in the pevets B 
of the leaver A, fig, 3. which, when loaded with it’s 
full weight 22 tons, required a power = 425 pound 
to overcome it’s refiftance, is by this method reduced 
to 2 pound 10 ounces j and, if there were any need 
of reducing it further, it might be done by applying 
two fmall quadrants to each pevet of the larger, 
which would reduce it to one ounce or lefs. 
It is not eafy to determine the quantity of friction 
that was in the plug frame, but that has alfo been 
reduced to by the application of feveral rollers 5 
inches diameter, whofe pevets are 4 inch diameter, 
on which it now moves. But it is evident that a 
power 440 4 has been faved by changing the 
pofition of the axis of the leaver ; and a power of 
42 1 pound 6 ounces by reducing the quantity of 
fridtion in the pevets. 
The vifible effedt, with refpedt to the working of 
the engine, according to the moft exadt obferva- 
tions by different perfons, both before, and after 
thefe feveral alterations were made, is, that it 
now makes 1 3 ftrokes at 8 feet per ftroke, for 1 5 
Y 2 that 
