Chap, i,] Engine. x 387 



E, the communication pipe between the receiver 

 and the cylinder ; it rifes five or fix inches up, in the 

 infide of the cylinder bottom, to prevent the injected 

 water from defcending into the receiver. 



F, the cylinder, of caft iron, about ten feet long, 

 bored fmooth in the infide ; it has a broad flanch in 

 the middle on the outficle, by which it is fupported 

 when hung in the cylinder-beams. 



G, the piilon, made to fit the cylinder exactly:, it 

 has a flanch rifing four or -five inches upon its upper 

 furface, between which and the fide of the cylinder a 

 quantity of junk or oakum is fluffed, and kept down 

 by weights, to prevent the entrance of air or water and 

 the efcaping of (learn. 



H, the chain and piflon fhank, by which it is con- 

 nected to the working beam. 



I I, the working beam or lever: it is made of two 

 or more large logs of timber, bent together at each 

 end, and kept at the diftance of eight or nine inches 

 from each other in the middle by the gudgeon, as re- 

 prefented in the plate. The arch-heads, I I, at the 

 ends, are for giving a perpendicular direction to the 

 chains of the pifton and pump-rods. 



K, the pump- rod which works in the fucking 

 pump. 



1 , arid draws the water from the bottom of the pit 

 to the furface. 



M, a ciflern, into which the water drawn out of the 

 pit is conducted by a trough, fo as to keep it always 

 full ; and the fuperfluous water is carried off by ancj* 

 ther trough. 



N, the jack-head pump, which is a fucking-pump 



wrought by a fmall lever or working-beam, by means 



of a chain connected to the great beam or lever near 



the arch g at the inner end, and the pump rod arthc 



C c 2 outer 



