Shaft Passer
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A shaft passer is a device constructed to allow a one cable to pass through another without breaking either. The device works by using a spoked, rimless wheel which allows cables to pass through as it rotates. The ends of the spokes are widened, and the cable is held together by a short curved sleeve through which these spoke ends slide.
Shaft passers were used during both world wars on Naval mine mooring cables, to prevent the mines from being caught by enemy cables swept along the sea bottom.[citation needed]
The devices are mention in the book Surely You're Joking, Mr. Feynman!. Feynman, with some incredulity, was introduced to the device while working at Frankfort Arsenal.
