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Box type pocket sextant.

1850-1859

Box type pocket sextant.

1845-1850

Box sextant from the offices of Wolfe Barry

circa 1880-1918

Box type pocket sextant.

1851-1856

Box type pocket sextant.

1810-1826

Box type pocket sextant.

1850-1880

Topometer, combined box sextant & range-finder, British, 1905-1920

1905-1920

Box type pocket sextant.

1845-1855

Box Sextant

1905-1915

Box Sextant

1855-1865

Pocket box sextant in leather case, made by Elliott Brothers, City of Westminster, London, England, 1853-1860. Consists of two circular lacquered brass plates (76mm) with lid that acts as a handle when used. Fitted with Inlaid silver scales, the index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Marked ‘Lt. E.J. Bori, Royal Engineers’.

Box type pocket sextant.

1853-1860

Pocket box sextant with separate black glass artificial horizon in boxwood bowl on three adjustable feet, made by Charles George Dollond, St. Paul's Churchyard, City of London, England, 1835-1845. Consists of two circular lacquered brass plates with lid that acts as a handle when used. Fitted with Inlaid silver 131° scale (-5° to 140°) with 30' divisions and a silver vernier (30’' div.). The index arm is rotated by a milled knob on the upper plate with two filter shades operated by lever. The index glass is fixed with adjustment for the horizon glass. Fitted with magnifier (single lens) on hinged 40 mm swivel arm and choice of a large and a small pinhole sight but telescope missing.

Box type pocket sextant.

1835-1845

Pocket double box sextant of 2½-inch radius, designed by Captain Christopher George (Trade Mark No.31) with two circular lacquered brass plates and two lids, by the company of, William Cary, Strand, City of Westminster, London, England, 1835-1845. Fitted with two Inlaid silver scales 135° and 123° (-5° to 150°) with 30 arc-minute divisions and a silver vernier with 1 arc-minute divisions and index arms rotated by milled knobs on the upper and lower plates. The index glass is fixed with adjustment for the horizon glass and a single lens magnifier is hinged on a swivel arm (40 mm) with choice of large and small pinholes

Double box sextant.

1835-1845

Surveyor's pocket box sextant with leather case, made by John Dennett Potter, Poultry, City of London, London, England, 1855-1865. Consists of two circular lacquered brass plates with lid that acts as a handle when used. Fitted with Inlaid silver 134° scale (-5° to 160°) with 30' divisions and a silver vernier (1' div.). The index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Fitted with magnifier (single lens) on hinged 40 mm swivel arm and choice of a large and a small pinhole sight but telescope missing. Marked ‘H O’ the property mark of the Hydrographic Office of the British Admiralty.

Box type pocket sextant with case.

1855-1865

Pocket box sextant with leather carrying case (damaged), made by Elliott Brothers, 30 Strand, City of Westminster, London, England. 1855-1865. Consists of two circular lacquered brass plates with lid that acts as a handle when used. Fitted with Inlaid silver scale (-5° to 165°) with 30' divisions and a silver vernier (1' div.). The index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Fitted with magnifier (single lens) on hinged 40 mm swivel arm and choice of a large and a small pinhole. Marked 'Walter I. Tatham' on lid (possibly owner).

Box type pocket sextant with case.

1855-1865