Hydrostatic Engine, 16? 
This engine (say the Patentees) bids fair, with the improve- 
ments that ingenuity may suggest, to become one of the most 
powerful, and at the same time, one of the most simple water ma- 
chines, that ever was invented. 
References to the Plate . 
Fig. 1. A perpendicular section of the box, &c. A a tube or 
canal, through which the water is coveyed into the engine. BB a 
box or cylinder, on which the pistons move. C a tube, that con- 
ducts the water from the box. DD the pistons, with their rods. 
E a valve, turning back and forth on a gudgeon, passing through 
its centre, and thus opening a communication alternately between 
the tube A, and each end of the box, and at the same time open- 
ing a communication between the box and the tube C, so that the 
water may be discharged from either end of the box, whilst the 
other is filling. 
Fig. 2. A perpendicular section of the engine. ABBC, the 
same as in Fig. 1. DD a rack, the sides of which act alternately 
on the rack-wheel, thus producing a continued rotatory movement. 
Its change from side to side, is effected by means of cogs in the 
ends, which gearing into the cogs of the rack-wheel, alternately 
raise and lower it. E the rack-wheel. FF a fly-wheel turning on 
the shaft of the rack-wheel. GG a dog, moving on its axis §*, at 
every change of the rack, and thus giving a reciprocated motion to 
the valve-rod. HH the valve-rod. I the winch acted upon, by 
the valve-rod, and giving motion to the valve, by means of its gud- 
geon. K a weight, suspended from the valve-rod, by a line pass- 
ing over puilies, in the top of the dog. L one side of the groove- 
box to regulate the movements of the rack. M a lever connected 
with the dog by rods of iron. N one of the standards that support 
the lever. O a weight to balance the rack. P one side of the 
sweep. 
Fig. 3. A horizontal section of the engine. AAA the frame 
of the engine. B the box with its pistons, &q. CCC a carriage 
connecting the pistons, and moving outside of the box. DD the 
sweeps connected to the carriage, by means of devices, so that it 
may vibrate, in conformity to the movements of the rack, which is 
attached to it. E the rack as represented at D, Fig. 2. FF the 
sides of the groove-box. G the dog. HH the main shaft, upon 
which the fly and rack-wheels turn, and to which other machinery 
of any kind may be attached I.I the fly-wheel. 
