Ward's Steam-Engine. 95 
dispensable parts of the Steam Engine, in such a way as to 
get rid of all the abovementioned disadvantages. 
In this Engine, the piston-rod is also the connecting-rod.* 
When applied to water-wheels, in propelling boats, the cyl- 
inder is placed within the water-wheel. Two centre-pieces, 
firmly fixed to the boat, one on each side of the recess in 
which the wheel is placed, serve as axes to the wheel, the 
boxes of which turn on necks prepared to receive them ; ; 
the centre-pieces, after traversing the boxes, are turned at 
right angles and extend, within “the wheel and towards its 
circumference, a distance equal to half the sweep of the 
piston ; at this distance from the centre of the water wheel, 
boxes are inserted in the centre-pieces to receive the gudg- 
eons of the cylinder ; ; the cylinder revolves on those gudg- 
eons about its centre of gravity. The steam is conducted to. 
and from the cylinder, by means of a double pipe; so fens 
the centre-piece answers the quadruple purpose of an 
duction-tube, an eduction-tube, a bearing for the wae 
wheel, anda bearing for the cylinder. 
he steam is alternately let into each end of the cylinder, 
by a contrivance similar to what was first used, I believe, in 
the Double Cylinder Steam-Engine of Mr. Hornblower ; 
and which will be easily Sen eis from pe following 
d taken from 3” ve a: “The cocks 
of thi (Herublewer’) Engine are seacals of two circu- 
lar plates, ground very true to ich other, and one of them 
turns round on a pin aes = eir centres : each i is Ait 
tire sectoral ape frures, 
inder required, the cocks of my Dane fey tel two, 
wines — 4 the same it by being nearly ninety 
length each. cocks are placed by the. side 
ine r, the -gudgeon of which answers to the “ pin” 
ieee e thought the description would be more readily understood, if 
the alphabetical references. were kept separate trom Sheers ‘See the 
fi its referenc 
t Rees Cyc. Art. Srram- Encixr.” 
