A part of a machine (such as a lathe or drill) that supports a rotating part
A structure atop a coal mine, used to sink and lift miners and loads.
1913, DH Lawrence, ,It was a beautiful day. At Brinsley pit the white steam melted slowly in the sunshine of a soft blue sky; the wheels of the headstocks twinkled high up; the screen, shuffling its coal into the trucks, made a busy noise.