Station Corrector

A white plastic square engraved in black with degrees on right hand side and BOW &QUARTER, SPED & COURSE are marked in red. A transparent plastic circle engraved in black for CORRECTION AND DISTANCE sits on top of white plastic and can be revolved in azimuth.
Bottom left: MAKERS. HARLING, LONDON.
Top left: STATION CORRECTO (At 3 Cables)

Object Details

ID: ACO1252
Type: Station Corrector
Display location: Not on display
Creator: Harling
Date made: Unknown
Credit: National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Measurements: Overall: 140 mm x 140 mm; 140 mm x 140 mm