Chapter LXXIX: 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.

=1714. Arms and boss cast in one:= the rim in segments, bolted together and to the arms.

=1715. Tension wheel.= The tie spokes are sometimes arranged in two sets at a slight angle to each other to prevent the rim turning without the boss. Bicycle wheels are of this class.

=1716. Wrought-iron wheel,= with cast boss.

=1717. Wrought-iron wheel,= with cast boss.

=1718. Rim in segments= bolted together, wood arms and cast boss, with sockets to receive arms; this type is much used for water wheels.

=1719. Railway wheel:= boss of cast iron with wrought-iron arms cast in. The rim is of rolled iron or steel riveted on. There are numerous methods of fastening the tyres to arms, detailed in the _Engineer_, July 23rd, 1880.

=1720. Spring rim split pulley.=

=1721. Segment fly-wheel,= with long radial bolts to secure the rim, arms, and boss together.

=1722. Large centre boss,= with rim segments bolted to it.

=1723. Wheel in halves;= the boss is held together by two bolts acting as cotters.