SECTOR n.
A mathematical instrument, consisting of two rulers connected at one end by a joint, each arm marked with several scales, as of equal parts, chords, sines, tangents, etc., one scale of each kind on each arm, and all on lines radiating from the common center of motion. The sector is used for plotting, etc., to any scale…
SET a.
t or lock nut. See under Nut. -- Set screw (Mach.), a screw, sometimes cupped or printed at one end, and screwed through one part, as of a machine, tightly upon another part, to prevent the one from slipping upon the other. -- Set speech, a speech carefully prepared before it is delivered in public; a formal or metho…