Steam-Engine — Physics, ^rc. 163 



which I mention merely in reference to the ^opposed utility 

 of this mode of operation, in connexion with Morey's engine. 



Morey's engine should rather be denominated a revolving 

 engine than a rotatory one, especially as it is essentially differ- 

 ent from one so called invented by Mr* Curtis. 



Plate I. Fig. 5, represents the arrangement of a double 

 engine for a boat, with its cylinders in different positions. 

 a a a, boilers ; b b, tar-vessel ; c, valve-box ; d, cylinders in 

 different positions ; e, piston-rod ; /, pitman ; h, centre-piece ; 

 i I, shaft ; k, valve ; I, steam-pipe ; m, escape-pipe ; «, con- 

 densers ; t, water-wheel ; v, face of the valves ; x, tar-fire. 

 The frame, holding the cylinder (c?) is, by its opposite sides, 

 so hung as to revolve. To the end of the axis of one side, 

 extended over the cylinder, is fixed the centre-piece (/t) 

 resembling a crank, from which the bar or pitman (/) com- 

 municates to the cross-piece of the piston-rod. On this same 

 axis, but outside the frame, is placed two circular pieces, one 

 of brass, the other of iron, [k) which we may call the valves. 

 One is fixed on the axis, the other moves, and accompanies 

 the frame and cylinder in its revolution ; from it, at opposite 

 sides, pipes lead the steam to each end of the cylinder. It 

 has a smooth face, which applies, and is kept by springs close 

 to that of its counterpart fixed on the said axis. Steam-pipes 

 lead from the boilers through the counterpart into the moving 

 valve. On the opposite side of the fixed piece the eduction- 

 pipe (o o) leads to the condensers. 



The condensers (p) are upright vessels, two to each cylin- 

 der, connected at top by a sliding valve box, so that the steam 

 enters them alternately. At bottom are two valves, kept 

 closed by weights. A stream of water is injected into the 

 condensers, which escapes by the bottom valves (p p) by 

 which also the air is blown out, at every stroke, in the samt- 

 manner the engine is cleared of air at first. 



There are also two cocks and cross-pipes seen, Plate 111. 

 Fig. 4, to change the steam from one side to the other of the 

 valve, to give a reversed motion of the engine. 



The power is communicated to its object from the opposite 

 side of the frame by the axis attached thereto, and supported 



