Quintant

Anodised brass strait-bar pattern frame, wooden handle. Signed on the limb 'Potter, London', and marked on the cross bar '[broad arrow] 7 Polar Exp. 1875'. Bronzed limb with inlaid silver scale from -5 to 165 by 10', measuring to 146. Silver vernier to 10'', zero at right. Tangent screw and clamp screw on the back of the index arm. Index glass adjustment by screws, horizon glass by capped milled knob. Four shades (all green), three horizon shades (all green). Magnifier and swivelling arm are missing. Telescope bracket in two parts, fitted for correcting collimation error, perpendicular adjustment by rising piece and milled knob. Telescope (185 mm) inverted image, no cross wires. Shaded eyepiece (green). Other telescopes, sight-tube, and two further eyepieces are missing. Radius 6.5'' (169 mm). In square fitted wooden box (blanc brass plate on the lid) containing in the lid a trade label for J.D. Potter, 31 Poulty, London'. The right arm of the frame, the telescope, milled knob, tangent screw and clamp are covered in light chamois leather for use in Polar regions. The instrument was presented to the Museum by Members of the Peary Arctic Club. It was used on an Arctic expedition of 1875.
John Dennett Potter