to give Moilon to VTater-fVlteels, 301 



HHH, the surface of the water with which the steam- 

 engine and the water-wheel are supplied. 



a, a, the steam-pipe, through which the steam is conveyed 

 from the boiler to the receiver. 



b, the feeding-pipe for supplying the boiler with hot water. 

 c,CyC,CfC, the condensing apparatus. 



dy dy the pipe which conveys the hot water from the con- 

 denser to the hot well. 



e^ e, i, valves for admitting and excluding the water. 



J'f, the injection-pipe, and g the injection-cock, 



h, the condenser. 



It does not appear necessary to say any thing here on the 

 manner in which this machine performs its operations with- 

 out manual assistance, as the method of opening the cocks, 

 by which the steam is admitted into the receiver and conden- 

 sed, has been already well described by several writers. But 

 it will be necessary to remark that the receiver, penstock, 

 and all the pipes, must be previously filled before any water 

 ean be delivered on the wheel ; and when the steam in the 

 boiler has acquired a sufficient strength, the valve at i is 

 opened, and the steam immediately rushes from the boiler at E 

 into the receiver A; the water descends through the tubes 

 A and B, and ascends through the valve k, and the other pipe 

 or tube B^ into the penstock C. This part of the operation 

 being performed, and the valve i shut, that at / is suddenly 

 opened, through which the steam rushes down the condensing- 

 pipe c, and in its passage meets with a jet of cold water from 

 the injection-cock g, by which it is condensed. A vacuum 

 bfeing made by this means in the receiver, the water is driven 

 up to fill it a second time through the valves e, e, by the pres- 

 sure of the external air, when the steam-valve at i is again 

 opened, and the operation repeated for any length of time the 

 machine is required to work. 



There are many advantages which a stearh-engine on this 

 construction possesses beyond any thing of the kind hitherto 

 invented ; a few of which 1 shall beg leave to enumerate. 



1. It is subject to little or no friction. 



2. It may be erected at a small expense when compared 

 with any other sort of steam-engine, . 



3, It 



