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Object number
W-223
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Classification
Navigational
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Object name
Octant
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Creator
Dollond, John or John II or Peter
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Description
Mahogany frame and index arm with brass section, inlaid ivory plates on the crossbar and on the back of the frame. Brass stop for index arm. No tangent screw; clamping screw on the back of the frame. Two shades (both red). Index glass adjustment by screw; horizon glass by screw, lever with a wing nut and clamping screw. Sight vane with two pinholes and a swiveling shutter. Ivory pencil cap and pencil are missing. Stepped dark brown stained wooden box, gouged out to accommodate the octant and a trade label for F.W. Lincoln & Co, Commercial Street, Boston (after 1858).
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Inscription/Sig.
Signed on a brass plate at the bottom of the index arm: Dollond London
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Period
c. 1750-60
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Material
mahogany, ivory, brass, glass, wood
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Place Of Prod.
England
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Dimensions
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Imperial(in) |
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Metric(cm) |
| Height |
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45.6 |
| Width |
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34 |
| Depth |
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7.6 |
| Diameter |
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| Circumference |
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Frame
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Imperial(in) |
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Metric(cm) |
| Height |
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| Width |
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