tl inte wis =) oy (x tages ort es 
Ward's Steam-Engine. 93 
tardation, the whole of the momentum, which existed in 
the reciprocating mass, at the time of its greatest velocity, 
is gradually transferred to the fly-wheel : and, in like man- 
ner, during the acceleration, this same quantity of momen- 
tum is again transferred from the fly-wheel to the recipro- 
cating mass.* I[t is this gradual transference of all the mo- 
mentum of the reciprocating mass to the: fly-wheel, and not — 
the power of the steam “ dragging the mass in an opposite 
direction,”—that ‘checks’ its motion, and causes it to 
= 
seems to me, seer arer a work worse than nu~ 
BP Fa pees veo ce ee — Giifeuien 
which, if not fatal, have proved so serious a disadvantage 
to their respective inventions, as to render them entirely 
useless in practice. If there be any exception to this re- 
mark, it must be in favour of the Revolving Engine, in- 
vented by Mr. Morey. Much, however, as ‘his ingenious 
machine appeared, at first, to promise, I apprehend it 
will und, upon a short trial, that he, too, has neglected 
to provide against substantial difficulties, while endeavour- 
ee get rid of such as were merely imaginary. 
e great disadvantage i in transferring momentum from 
a straight line to the cirele, arises from the friction, oe 
necessarily attends the operation. When, for instance, t 
piston-rod is made to play in whatare called parad/el a 
and a connecting-rod, attached to the cross-piece of the 
slides, gives motion to the crank, there are but two points, 
in which the original direction of the power, and its direc- 
tion, as. applied. to the crank, coincide with one another. In 
all other points, the connecting-rod forms an angle with the 
varies, from the smallest, which the 
uction of the Engine will eee greater, as 
the trliskapiena is longer, and less, as you 1 increase the 
pee of the connecting rod. In all but two points, there- 
fore, the power reacts obliquely upon the guides; and, 
when: the angle is bie largest, the strain and friction are sO 
© This is the opinion of Oliver Evans ¥ Vid. “ Abortion of the ges 
‘Steam Psiocer® Guide ;?? poneet inl 
