Two iron correcting spheres for projector-type binnacle, by Kelvin Hughes Limited, British, 1950-1955 Two correcting spheres 1950-1955
Binnacle with correctors for quadrantal semicircular and heeling errors, azimuth mirror used to take bearings from compass by raising the line of sight, azimuth mirror component, and key for compass binnacle, patented by William Thomson, and made by James White, Glasgow, Scotland, 1876-1879 Binnacle with correctors for quadrantal semicircular and heeling errors 1876-1879