Davis Mark II Plastic Marine Sextant
The octant has a grey plastic plate, a plastic handle and a stiffening bar on the back. It has one blue plastic index shade and no tangent or clamping screw. Index and horizon-glass adjustment is made by screws with an Allen key. Attached to the octant is a plastic, non-adjustable telescope bracket. The fixed plastic sight-tube is 32 mm in length with three plastic shades in blue, yellow, and green. Accompanying the octant is an Allen key. The octant has no box.
The instrument has a grey plastic scale from -35° to 100° by 1°, measuring from -14° to 100°. The octant has a plastic vernier measuring to 2 arcminutes, with zero at the left.
This instrument has been identified as an octant, because it measures up to 105 degrees. The iventor, however, identified the object as a sextant.
The instrument has a grey plastic scale from -35° to 100° by 1°, measuring from -14° to 100°. The octant has a plastic vernier measuring to 2 arcminutes, with zero at the left.
This instrument has been identified as an octant, because it measures up to 105 degrees. The iventor, however, identified the object as a sextant.
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Object Details
ID: | NAV1186 |
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Collection: | Astronomical and navigational instruments |
Type: | Octant |
Display location: | Not on display |
Creator: | Young, Douglas Johnson |
Date made: | 1965 |
Credit: | National Maritime Museum, Greenwich, London |
Measurements: | Overall: 73 mm x 213 mm x 217 mm |
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