plural of throw-crook

An agricultural instrument for twisting ropes out of straw.

light mill

plural of Crookes tube

plural of Crookes radiometer

Alternative form of apple crook

A hand-held, wooden agricultural implement used in the harvesting of apples.

(physics, dated) The dark space within the negative-pole glow at the cathode of a vacuum tube, observed only when the pressure is low enough to give a striated discharge.

Synonym of Crookes space

plural of apple crook