HYDROSTATICS. 431 



is full to the top e, the water will run over the bend e, 

 down the part e F, and go off at the mouth G ; which 

 will make a great stream at G; and that stream will 

 continue, till the syphon has carried off all the water 

 from the well B ; the syphon carrying off the water 

 faster from B than the pipe D brings water to it : and 

 then the swell at G will cease, and only the water from 

 the small pipe C C will run off at G, till the pipe D fills 

 the well B again ; and then the syphon will run, and 

 make a swell at G as before. 



And thus, we have an artificial representation of an 

 ebbing and flowing well, and of a reciprocating spring, 

 in a very natural and simple manner. 



An Account of the Principles by which MR. BLAKEY pro- 

 poses to raise Water from Mines, or from Rivers to 

 supply Towns and Gentlemen's Seats, by his new-in- 

 vented Fire-engine, for which he has received His 

 MAJESTY'S Patent" 1 . 



Although I am not at liberty to describe the whole 

 of this simple engine, yet T have the Patentee's leave 

 to describe such a one as will shew the principles by 

 which it acts. 



Note 131. The subject of the steam-engine has already been yery 

 fully examined, in a note to Mr. Ferguson's treatise on Hydrostatics; 

 and the Editor merely inserts the following account of Blakey's en- 

 gine from a wish to present the Lectures of this valuable Teacher to 

 perfect form. 



