Y AN EBONY AND BRASS NAVIGATIONAL OCTANTG. GOWLAND, LIVERPOOL, CIRCA 1840The 11 inch frame incorporating central T-shaped hand-piece inset with bone signature plate inscribed G. GOWLAND, 76. SOUTH. CASTLE. ST. LIVERPOOL beneath turned bone finial unscrewing to reveal a pencil, the index arm mounted with mirror opposing Vernier aperture scale calibrated in minutes of arc for reading the inset curved scale divided for every twenty seconds of arc, the underside with pivot clamp and endless tangent screw adjustment, the sight vane with twin pin-holes and shutter opposing horizon glass, set of three hinged shades/filters and another pair of shades beyond the horizon pane, the tapered mahogany case with printed paper trade label inscribed JOHN BRUCE, Chronometer, Watch & Nautical Instrument Maker, SALTHOUSE BUILDINGS, 26, WAPPING, opposite the South end, Salthouse Dock, LIVERPOOL... to the inside of the lid.The box 33cm (13ins) long, 29cm (11.5ins) wide, 10cm (4ins) high.George Gowland is recorded in Clifton, Gloria Directory of British Scientific Instrument Makers 1550-1851 as working from 76 Castle Street, Liverpool 1851-53. The London Gazette of 17th October 1856 lists him as working at this address as a chronometer and nautical instrument maker who registered a patent in 1853.John Bruce was also a manufacturer of and retailer of chronometers and nautical instruments who traded from 92 Wapping, Liverpool 1865-1939.注意: Y - This lot contains endangered species and may be subject to CITES regulations. Prospective bidders are advised to familiarize themselves with relevant customs regulations prior to bidding if they intend to import the lot into another country. A buyer’s inability to import or delay in obtaining a licence cannot justify delay in payment or cancellation of sale.