Ward's Steam- Engine. oy 
at these points of division, with the effects produced by a 
like number of impulses at the circumference of the reduced 
circle. The pressure of the steam upon the piston being 
uniform throughout the stroke, it follows that the impulses 
at all points are equal to one another; an anit is being the 
nD afie Gacolatae decimals will | admit. The for- 
ca wound be this :— 
Let the vaso .- the circle destribed by the crank = 1. 
Then acer &c. =. 6366x90=the sum of the 
2 
natural sines of the quadrant for every degree including ra- 
di wus... 
eljecin, carey ees to my engine, it 
hiss bes suggested by some, who seen the model, 
that the power is exerted at a  Tindvabtige ota the cir- 
cumstance, that the centre of reaction is within the circle of 
motion. Nothing is easier than to show, however, that, sup- 
posing, as we must in all such comparisons, the length and 
diameter of the cylinder, and also the elastic force of the 
steam, to be equal in each, the effect produced in my en- 
gine i is equal to roduced in the Lever Engine. 
et the line DB (Plate III. Fig. 1.) represent the elastic 
ree of the steam ; the point D be the point t of reaction ; 
sire BKZ, the circle of motion. The force DB 
resolvable into DE and EB, parallel and perpendicular 
respecte a —— AB ; and that part of it, which is 
exerted in the dir of the tangent, will be represented 
by the the line TB. "This | is the force exerted in the Lever 
“Tn my engine, B is the point of reaction, and LDM, the 
