n. 1. One who, or that which, finds; specifically (Astron.), a small telescope of low power and large field of view, attached to a larger telescope, for the purpose of finding an object more readily, called also a finder telescope or finder scope. [ 1913 Webster +PJC ]
2. (Micros.) A slide ruled in squares, so as to assist in locating particular points in the field of vision. [ Webster 1913 Suppl. ]