Product images of Sextant
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Manufactured in the UK
Polished brass frame with wooden handle. Signed on the cross bar 'Ramsden London', and marked on the top end of the index arm 'D.33' [Hydrographic Office serial no, see serial no index]. Brass scale from -2 to 134 by 20, measuring to 120. Brass vernier to 20'', zero at right. Tangent screw on the front of index arm (milled knob missing), clamp screw on the back. The lower part of the index glass is silvered, and fitted with a Maskelyne flap, the upper part is black. Index and horizon glass (glass missing) adjustment by screws. Three shades (all red), one horizon shade (red). Telescope bracket in two parts, fitted for correcting collimation error, perpendicular adjustment by rising piece and milled knob. Telescope (127 mm) inverted image (possibly not original to this instrument). Radius 15'' (381 mm).
- Image reference: F6420-001
- National Maritime Museum, Greenwich, London. Acquired with the assistance of the National Heritage Memorial Fund.