Details and Image
|SEC019||Sector||Gilbert & Sons / London||William Gilbert and Sons||England||Ivory and Brass||6 in||c. 1810|| C5
Notes: "Unusual brass hinge on this sector similar to hinge design on Coggeshall rule with brass bolsters. In addition to typical sector scales, there are additional scales on one side including: LnMe (longitude meridians), Cho (chords), Lat (latitude), Hou (hours)."
Click on the Condition Code to obtain more details.