David: Question: What wood was favored by wheelwrights for making hubs, and why? (Hint: it was also used to make dartboards.)
a) White oak, because it's tough.
b) Elm, because it's hard to split.
c) Hickory, because it's very hard.
Elm, because it's hard to split. Wheelwrights chopped large mortises all the way round a hub for spokes and bored a large hole through its center for the axle. A wood that split easily, such as white oak, wouldn't have been able to stand up to the strain, no matter how tough it was. Resistance to splitting and resistance to compression are two very different qualities.