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Numero oggetto
A-257
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Navigational
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Nome oggetto
Octant
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Descrizione
Ebony frame with brass index arm and fittings. Tangent screw on the front of the index arm; clamping screw is on the back. Three index shades (red, red, green); one horizon shade (green). Index glass adjustment by screw; horizon glass by screw, square-headed screw and detached key, and worm gear. The sight vane has two pinholes and a swiveling shutter. Ivory cap for (missing) pencil; detached adjusting key. Fitted keystone mahogany box with trade labels for H. Duren, 20 Burling Slip, New York and Samuel Emery, Water Street, Salem (before 1864).
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Materiale
Signed on the inlaid ivory plate on the crossbar: "SPENCER & Co. LONDON"
Marked on the inlaid ivory plate: H. Duren New-York.
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c. 1846
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Materiale
ebony, ivory, brass, glass, mahogany
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Soggetto
England
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Dimensioni
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Imperial(in) |
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Metric(cm) |
| Height |
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32.9 |
| Width |
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24.9 |
| Depth |
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8.4 |
| Diameter |
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| Circumference |
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Imperial(in) |
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Metric(cm) |
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