THE ARCHIBALD WHEEL.
| Diameter | 57¾ inches. |
| Width of tire | 2¾ " |
| Weight of wheel | 200 lbs. |
The nave-box (a) is made of aluminum-bronze. It fits over the axle-arm (c) and has groove for lubricant, as indicated.
The nave (b) of malleable iron.
The spokes, 16 in number (s), are made of oak or hickory.
Fig. 56.
The felloes, 8 in number, are made of oak or hickory.
The tire is made of steel, ½ inch thick.
The bolts, clips, linch-pins, and washers are made of metal.