94 Ward’s Steam-Engine. 
great, as not only to occasion a very serious loss of power, 
ut io wear away the guides, and by increasing the play of 
the sliders, to destroy, in a short time, the parallelism of 
the motion. The only mode of obviating any part of these 
disadvantages, was, by having a short crank-piece, and a 
long connecting-rod. The greatest ae would then be 
small: the friction, of course, lessened; and the engine 
will stand a considerable length of time Shee need of re- 
Poles 
What, then, as it appears to me, will be found a serious, 
if not a fatal, disadvantage in Mr. Morey’s plan, is, that he 
is obliged to retain this parallel motion by guides. His en- 
gine, indeed, so far as this principle is concerned, is pre- 
cisely the same with the common Engine, which has the 
parallel motion by guides ; ; the only difference being, that 
the point of action in the one is the pointof re-action, in the 
other—a difference, however, which, in this respect, must 
chan Reatetbalance its neatness of construction and com- 
pactness of form 
Having Seroicl my life to the study of mathematics, both 
pure and mixed, and being a mechanic in practice as well 
eory, I was led to examine the various methods, which. 
hate been devised to render the power of steam subservient 
to the purposes of human life ; and it occurred to me very 
early, in the course of my investigations, that the received 
np ity and avoid friction were my sole objects ; and I be- 
lees mere at length succeeded, in combining the in- 
iness, complication, a and expense. To 
