ENGINE FOR RAISING AND LOWERING WEIGHTS. 47 



The drawing Fig. 2, (hows how the fyphon engine is to Other tifes and 

 be applied to ftreams of water, the advantages of which are, applications of 



i • „ , .„ , r ~ • the engine. 



that the engine as well as the mill work, or manufacturing 



machinery it may drive, may be placed where moft conve- 

 nient, above or below the head or dream, to be worked by a 

 fall of water from the leaft to the greateft height, or by any 

 dream or river, the tail water below acting and having as 

 much power as the head, anfwering to the height of either. 

 Nor can a drop of water efcape without performing its full 

 duty. The power is therefore greater, and not liable to the 

 difad vantages attending a water wheel. In tide waters it 

 would work ebb and flood fo long as there was a difference of 

 two feet or lefs in the height, regulating itfelf, fo that the 

 power may be equal, let the head and tail water rife or fall, 

 by which a fmooth uniform motion is maintained and adapted 

 to the fmallefl as well as the ftrongeft power wanted. If the 

 tail water re-ac~ts upon a water wheel, it muft lofe fo much of 

 the power of the fall, or in other words, whenever the tail 

 water rifes above the loweft wath boards of the wheel, a 

 counter aclion will be exerted as is well known againft the 

 power of the wheel. A conliderable quantity of the ftream 

 muft likewife efcape without any good effect. Thefe difad* 

 vantages of the water wheel, are removed by the fyphon en- 

 gine ; and in frofty weather being fed by a pipe from below Frofty weather 

 the ice, it will not be impeded, becaufe its velocity in palling af J efts ij, lefs d 

 through the engine, will prevent the water being expofed a other hydrauli* 

 fufficient time to the cold atmofphere to congeal it ; and when mac hinei. 

 at reft the engine may be left empty. It is fcarce neceflary 

 to obferve, that when the engine is fixed below the running 

 head of the ft ream, it will fill as foon as the fluice is opened, 

 and (et itfelf to work ; but when placed above the head, it 

 will require fufficient water to fill the whole interior fpaoe, 

 which being thus charged and converted into a fyphon, will 

 then work as well and with as much power as if the engine 

 were placed below the head of the ftream. 

 I am, 



Dear SIR, 

 your moft obedient and 



very humble fervant, 



JOHN HARRIOTT* 

 Thames Police, Dec. 20, 1 802. 



REMARKS. 



