B66-474 VERNIER COMPASS. T. Whitney. 5" needle, silvered face. "T. Whitney, Maker" and fleur-de-lis at north, "Philadelphia" at south. One level at south. The case is turned by an uncommon cog mechanism which doesn't have a knob; either the knob has been lost or it was meant to be turned with a small wrench. The glass face has come loose and can be stuck inside the cover if the cover is not removed carefully. Serial number 277. Brass is tarnished but undamaged. Whitney was listed as an instrument maker in Philadelphia from 1802 through 1824. Good 250-500