IZ 2 Of Hydraulic Engines.

PlateXIIs. Water may be raised by means of a streamThe Per- J, B turning a wheel C D E, according to thefian ^ order of the letters, with buckets a, a , a, a , &c.' hung upon the wheel by strong pins b, b, b, b,&c. fixed in the side of the rim ; but the wheelmust be made as high as the water is intendedto be raised above the level of that part of thestream in which the wheel is placed. As thewheel turns, the buckets on the right-hand godown into the water, and are filled therewith, andgo up full on the left-hand, until they come tothe top at K-, where they strike against the endn of the fixed trough As, and are thereby over-set, and empty the water into the trough ; fromwhich it may be conveyed in pipes to the placewhich it is designed for: and as each bucketgets over the trough, it falls into a perpendi-cular position again, and goes down empty,until it comes to the water at A, where it isfilled as before. On each bucket is a spring r,which going over the top or crown of the bar m(fixed to the trough M) raises the bottom of thebucket above the level of its mouth, and socauses it to empty all its water into the trough.

Sometimes this wheel is made to raise waterno higher than its axle; and then, instead ofbuckets hung upon it, its spokes C, d, e,f, g. h,are made of a bent form, and hollow within ;these hollows opening into the holes C, Z), E, F,in the outside of the wheel, and also into thoseat O in the box N upon the axle. So that, asthe holes C, D, &c. dip into the water, it runsinto them; and as the wheel turns, the waterrises in the hollow spokes, c, d, &c. and runsout in a stream P from the holes at t), and fallsinto the trough 6), from whence it is conveyedby pipes. And this is a very easy way of raising

water,