Engine at ScJyemmtz nvorl itfelf, iiq 



R. A veffel fufpended from the levers of I and L, capable of containing a weight of water 



fuflicient to fliut them. 

 S. A veffel fufpended from the lever of N, it muft contain water enough by its weight to 



open N : it is connefted by a chain to R, to keep it down as long as N is open. 

 T. A fyphon pa fling from the bottom of H, near its upper edge, and down again to the 



mouth of R. 

 V. A felf moving valve, of a fufEcient levity to rife, when the water in B comes up to 



it, and clofe the pipe E ; into which no water would elfe pafs from B. A ball-cock, 



fuch as ufed in common water cifterns, would alfo do here. 

 X. A fyphon from the bottom of R riling within an inch of its top, and pafling down 



again to the mouth of S. 

 Y. A fmall pipe at the bottom of S ; this may have a ftop-cock to regulate it, which 



when flopped will alfo Hop the engine. 



Explanation. 

 The mode of this engine's working is as follows : fuppofc the veffels V H R and S 

 empty of water, and the cocks K and Y open, and the veffel C full of water. The weight 

 on the lever of L will then open the cocks L and I, on which the water from A will flow 

 into B and H. As the water rifes in B it will force the air through E into C, which 

 ftrongly preffmg on the water in C will force it up through the pipe F, till the water in B 

 rifes to the level of V and clofes it, at which time H will be full of water, (the quantity 

 flowing in being fo regulated by the cock K) and the water will flow from it through the 

 fyphon T into the veffel R, which as it fills Ihuts the cocks I and L, and prevents any 

 more water coming into B and H. When R is full, the water flows through its fyphon X, 

 which fills S, and by it opens N, which empties B of water, and keeps N open as long as 

 there is any water in H. 



When H is empty, B will be fo too (being fo regulated by the cock K) on which in a 

 moment or two R and S will alfo be empty ; which will caufe the cocks I and L to open, 

 and all things be again in the ftate firll fuppofed, for a repetition of the operations 

 defcribed. 



To ftop the engine the cocks at K and Y fliould be (hut, while S is full of water. To 

 fct it working they fliould be opened, and this is all the attendance it will require. As 

 no one but an engineer fliould attempt to conftruft fuch an engine as this, it was ufelefs to 

 reprefent the manner of connecting the pipes by flaches, or otherwife, or the proper me- 

 thods of fattening and clofing all parts, which are all well known to fuch as have made 

 this art their ftudy. If this method of effefting the purpofe fliall be efteemed worthy of 

 being adopted by any of them, it will give me great pleafure to have contributed to the 

 improvement of an engine fo ufcful, where it can be adopted. 



Your very humble Servant, 



JOHN WHITLEY BOSWELL. 



P. S. 



