Tracker

TRACKER. A thin flat strip of wood used in the mechanism of an organ for the purpose of conveying leverage from one portion of the instrument to another. A tracker differs from a sticker in the fact that a tracker pulls, while a sticker pushes; while therefore a tracker can be flat and thin, a sticker is round and rigid. For example, if, when one end of a key is pressed down it raises a sticker at its other end,...