whim shaft
Webster's Dictionary (GCIDE)
1.A sudden turn or start of the mind; a temporary eccentricity; a freak; a fancy; a capricious notion; a humor; a caprice. [1913 Webster]
Let every man enjoy his whim.— Churchill.[1913 Webster]
2.(Mining) A large capstan or vertical drum turned by horse power or steam power, for raising ore or water, etc., from mines, or for other purposes; -- called also whim gin, and whimsey. [1913 Webster]
Whim gin (Mining), a whim. See Whim, 2.
Whim shaft (Mining), a shaft through which ore, water, etc., is raised from a mine by means of a whim. [1913 Webster]
Syn: Freak; caprice; whimsey; fancy.
Usage: Whim, Freak, Caprice. Freak denotes an impulsive, inconsiderate change of mind, as by a child or a lunatic. Whim is a mental eccentricity due to peculiar processes or habits of thought. Caprice is closely allied in meaning to freak, but implies more definitely a quality of willfulness or wantonness. [1913 Webster]