176 Mr Dickson w* a Netv Wate?'-P?rssure E7igme. 
the universality of its application, nothing can be accomplished 
by means of it alone. To render it effectual, some other charac- 
teristics must be combined with it. Concerning these, the fol- 
lowing circumstances deserve to he remarked. 
(To he continued.) 
Abt. ^^YK..~-^Desc7'iption of the Patent Water-Pressure 
Engirw^ invented by Mr James Dickson, Engineer. Com- 
municated by the Inventor. 
TChIS water-pressure engine, (which is on the principle of the 
Hydrostatic Paradox), like all other machines that are impelled 
by water, can only be useful where water descends from a higher 
to a lower point. The whole water employed is conveyed in a 
pipe, from the place where it is collected, to the cylinder of the 
engine, and after raising or depressing a piston in it, is carried 
off by another pipe to the place where it is discharged. The height 
of the fall is reckoned from the surface of the water in the reser- 
voir where the pipe that conveys it to the machine is laid, to the 
surface of the water in which the pipe that carries it off is im- 
mersed. 
Let us suppose that the water is conveyed to the cylinder C^ 
Plate VI. Fig. 1. by a continuation of the pipe A, Fig. S. and 
passes through the stop-cock 1, which is open. The stop-cock 
2 being shut, the water ascends the pipe B, enters the cylinder 
by the valve E, and pressing against the under side of the pis- 
ton, raises it through the whole range of the crank, as shewn in 
Fig. 1. The valves E and G being connected, are now shut, 
and upon the piston commencing its descent, the valves F and 
H, which are also connected, begin to open. The water now 
entering at F, presses down the piston, and the water which in 
the upward stroke went in at E, is now issuing out by the valve 
H, down the pipe L, through the cock 3, which is open, and 
along the pipe M, to the place where it is discharged. The 
column of water below the cylinder, adds to the hdght of 
the upper column, by relieving the eduction orifices G and H al- 
ternately, of the weight of the atmosphere, in proportion to the 
perpendicular length of the column L and M, For, if we sup- 
