Ward’s Steam-Engine. 97 
ing accelerated during one half of the ag hay and retard- 
ed during the other half; but its revolving motion is con- 
tinual, moving always the same way. The celerity of its 
revolution, or velocity of its angular motion, regularly and 
alternately increases, during one half of its revolution, and 
falls off just as much, during the other half : but, for reasons 
similar to that, which I gave above, this operation is at- 
tended with no disadvantage; for the momentum, whi 
the cylinder, during its acceleration, receives from the 
wheel, it returns again to the wheel, during its retardation ; 
so that it accelerates the wheel as much, during its own re- 
tardation, as it retarded the wheel, during a own accele- 
ration. It is this peculiarity of motion cylinder, 
(namely, its regular and alternate saaelaiaiess and retarda- 
tion,) which | induced me to oy so my Engine by she 
name of The Al -Eng 
To dispense with ‘the fly-wheel, it was long ago sugges- 
ted, that, if two cranks were used in such away as that one 
should be at its greatest action, while the other was at the 
dead-point, is motion would be very nearly regular; and 
Mr, Brunel, in England, constructed, not many years since, 
an oneine upon this age baving two cylinders, which acted 
ach 0 ac ack are sus side by side 
the water- wheel, between the same two centre-pi their 
contiguous: sides having, the one a box, the other re sa 
inserted in the box: and they are further supported by a 
bridge, extending from the ends of each around the other, 
embracing seg opposite gudgeon. The cocks are placed on 
eo the cylinders in the manner above describ- 
ed; the: Sail being co condueted to and from each Baja 
through aig aeaey pia aaigaaae 
