[1707]. Leffel’s turbine, inward and downward flow; has one outer ring of fixed vanes and two inner sets revolving, but having different angles of flow.
[1708]. Undershot jet wheel for high pressure water.
Many other forms of turbines are extant, but are mostly modifications of the above types. The best types have means of varying the angle of the vanes and areas of passages to suit varying quantities of water.
Section 91.—WHEELS IN SEGMENTS.
[1709]. Heavy gearing for rolling mills, &c., with dovetailed joints wedged and packed.
[1710]. Wheel cast in sectors bolted together.
[1711]. Bevil wheel in halves.
[1712]. Wheel with rim in segments bolted together, and provided with bored and cottered sockets for arms in both rim and boss.
[1713]. Fly wheel rim, cottered and dowelled together.