The motor shown in plan by Fig. 1 and in elevation by Fig. 2 will develop 1/3 brake-horse-power with a fall of 30 ft. through a 2-in. pipe, and 1/2 brake-horse-power with a fall of 50ft., the speeds being about 3,000 and 5,000 revolutions per minute. To make the wheel, get a brass casting A (Fig. 1) to be turned to 2 3/4 in. diam. by Jin. wide. Fix centres in the disc and scribe a guide circle 1 9/16 in. in diameter; mark off twelve equal parts on the edge, and from these draw tangents to the guide circle. With a sharp chisel mark in the lines to about Jin. backfrom the rim, and mark lines across the rim joining the marking on both sides. Saw these lines in about 1/4 in. with a sharp hack-saw, for receiving the cups. From 1/16-in. sheet brass stamp the cups with the punch (Fig. 3) and trim off with shears. Then place the cups in position, tin the joints with a soldering bolt, and place the cup disc on a fire to sweat. Castings for the bearings should be turned to dimensions (see Fig. 1), making the groove in the centre an exact fit for the 3/32 in. sheet metal, of which the casing is constructed Obtain a casting for the gland to which the nozzle is fitted, and turn this inside an exact fit for the nozzle. From 1/8 -in. sheet iron cut out and bore the two flanges 0 (Fig. 1). The lower half of the casing is worked from 3/32 in. sheet iron (blued). First cut out two pieces to shape B (Fig. 2). At each top edge file out a central semicircle exactly the diameter for the bushes. From the same metal cut two strips l9/16 in. broad and 6 in. long, and bend them to shape D (Fig. 2). Fix the whole of these parts by twisting thin wire round them and solder all together. The top cover is next made in the same way. The nozzle gland is then carefully fitted and soldered or brazed on. As a caution, do not make the nozzle of a high-speed motor more than fin. bore at the opening, but make it larger for a slower speed.

Small-power Water Motor.