What is "bull wheel"

Bull \Bull\, a. Of or pertaining to a bull; resembling a bull; male; large; fierce.

Bull bat (Zo["o]l.), the night hawk; -- so called from the loud noise it makes while feeding on the wing, in the evening.

Bull calf. (a) A stupid fellow.

Bull mackerel (Zo["o]l.), the chub mackerel.

Bull pump (Mining), a direct single-acting pumping engine, in which the steam cylinder is placed above the pump.

Bull snake (Zo["o]l.), the pine snake of the United States.

Bull stag, a castrated bull. See Stag.

Bull wheel, a wheel, or drum, on which a rope is wound for lifting heavy articles, as logs, the tools in well boring, etc.

n. A type of large windlass used in drilling.