54^ Neiu and very fimple Steam Engine. 



whed, and when the fteam in the boiler has acquired a fufficient ftrength, the "valve at c is 

 opened, and the fteam immediately rufhes from thciboiler at Einto the receiver A, the water 

 dcfcends through the tubes A and B, and afcends through the valve e and the other pipe or 

 tube B into the penftock C. This part of the operation being performed and the valve c 

 fliut, that at a is fuddenly opened, through wliicli the fteam rufhes down the condenfing 

 pipee, and in its paflage meets with a jet of cold water from the injeftion cock g, by which 

 it is condenfed. A vacuum being made by this means in the receiver, the water is driven 

 up to fill it a fecond time through the valves ee, by the preflure of the external air, when the 

 fteam-valve at f is again opened, and the operation repeated for any length of time the 

 machine is required to work. 



There are many advantages which a fteam-engine on this conftruftion poffefTef, beyond 

 any thing of the kind hitherto invented ; a few of which I (hail beg leave to enumerate. 



1. It'ls fubjeft to little or no friftion. 



2. It may be erected at a fmall expence when compared with any other fort of fteam- 

 engine. 



3. It has every advantage which may be attributed to Boulton and Watt's engines, by 

 condenfing out of the receiver, either in the penftock or at the level of the water. 



4. Another very great advantage is, that the water in the upper part of the pipe * 

 "adjoining the receiver, acquires a heat by its being in frequent contaft with the fteam, 



very nearly equal to that of boiling water ; hence the receiver is always kept uniformly hot 

 as in the cafe of Boulton and W'*'''^^"8'"^S" 



5. A very fmall ftream of water is fufHcient to fupply this engine, (even where there is 

 no fall) for all the water raifed by it is returned into the refervoir HHH. 



From the foregoing reafons it manlfeftly appears that no kind-of fteam-engine is fo well 

 adapted to give rotatory motion to machinery of every kind as this. Its form is fimple, 

 and the materials of which it is compofed are cheap ; the power is more than equal to any 

 other machine of the kind, bccaufe there is no deduitiort to be made for friction, except 

 on account of turning the cocks, which is but trifling. 



Its great utility is therefore evident in fupplying water for every kind of work per- 

 formed by a water-wheel, fuch as grift-mills, faw-mills, blaft-furnaces, forges, &c. 



* Not being thrown oiit by a fide aperture, as in PlateXVIIi Vol. I, of our Journal, but merely raifed 

 and deprefled in the pipe AB.---N. ' 



III. New 



