Octant with 17" ebony frame and limb, brass index arm, inlaid ivory scale with diagonal divisions and ivory plate marked 'George Morris 1755', probably English, maker unknown, 1755

Sextant, marked, made by William Cary of London, c. 1890

Sextant, anodized brass Dollond-pattern 7" frame with polished brass limb and wooden handle with brass-lined hole, in polished mahogany box with certificate, used on the British Antarctic Expedition 1901 - 1904 (the Discovery Expedition), signed by Henry Hughes of London, c. 1900

Sextant, anodized brass diamond and diamond-pattern 8" frame, polished brass limb and wooden handle, in fitted mahogany box, signed and made by William Cary of London, 1890

Quintant (sextant), anodized brass 4" frame, polished brass limb, and wooden handle, in mahogany keystone box, used on the Antarctic Expedition of 1901, signed and made by William Cary of London, c. 1900

Double-sounding sextant for measuring wide angles, anodized brass Dollond-pattern 7" brass frame, polished brass limb and wooden handle, in square fitted mahogany box, signed and made by Henry Hughes and Son of London, c. 1894

Artificial glass horizon, circular anodized brass plate on three levelling feet with ivory knobs, covered with blackened glass plate (mirror), and with spirit level, signed and made by Francis Watkins and William Hill of London, c. 1850

Artificial glass horizon, rectangular anodized brass case on three levelling feet, covered with blackened glass plate (mirror), and with two spirit levels, in wooden case, signed and made by Elliott Brothers of London. c. 1880

Artificial glass horizon, rectangular anodized brass case on three levelling feet, covered with damaged blackened glass plate (mirror), with separate spirit level, in fitted wooden box, signed and made by Thomas Jones of London, 1811 - 1814

Artificial glass horizon, rectangular anodized brass case on three levelling feet, covered with blackened glass plate (mirror), with two spirit levels, signed and made by Elliott Brothers of London, c. 1860

Artificial glass horizon, circular anodized brass plate on three levelling feet with ivory knobs, covered with a blackened glass plate (mirror), with spirit level, in fitted wooden box, as used on the Antarctic Expedition of 1901, signed and made by Watkins and Hill of London, c. 1850

Surveyor's angle sextant, anodized brass frame of two circular plates, with screw-in wooden handle, in leather carrying case, signed and made made by Henry Hughes & Sons of London, c. 1892

Sextant, oval pattern brass frame, some parts missing, in mahogany keystone box, made by W. Endersbee and Son of London, c. 1840

Sextant, double-frame bridge, brass with wooden handle, hand lens missing, in damaged mahogany keystone box, signed and made by Jesse Ramsden of London, c. 1795

Octant, with brass frame, limb and index arm, wooden handle, silver scale, in fitted mahogany keystone box, made and signed by Jones of London, c. 1860

Sextant, brass diamond and curved frame and limb, wooden handle, inlaid silver scale, in mahogany keystone box, signed and made by Alexander Dobbie of Glasgow, c. 1880