runk, or of boards nailed together to form a circular disk.
Such are still used in Greece.
The usual carriages of the ancients had two wheels, but four-wheeled carriages are shown in the Theban paintings and elsewhere, and are carefully described by Herodotus.
(See cart, page 485.) The ferate orbes of Virgil are wheels shod with iron.
Persius, Martial, and others call the tire canthus. Pliny ascribes the invention of four-wheeled wagons to the Phrygians.
(See Fig. 1253, page 528.) At Portici are the remains of a Roman chariot-wheel; a band of iron forged out of a single piece, about 48 inches in diameter, nearly 2″ broad and 1″ thick.
A portion of the nave has been preserved, which is bound with iron, and this again by a bronze plate secured by bronze nails.
Jones's iron wheel.
The common iron wheel of England has cast-iron hub (nave) and rim, and wrought-iron spokes.
The rim has holes flaring to the outside, so as to hold the ends of the spokes, which have conical hea