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Description: | Table-16 x 13.5 x 0.75" (40.6 x 34.3 x 1.9cm). Wood with brass tripod mounting socket attached at centre of underside.
Rule-16.5 x 14 x 0.3" (41.9 x 35.5 x 0.8cm). Boxwood frame which fits on plane table. Upper surface graduated 6"-0-6" by 10ths on top and bottom bars, 7.5"-0-7.5" by 10ths on side bars, 0-360 by 30' in both directions around frame. Reverse surface graduated 6"-0-6" by 10ths on top and bottom bars. 7.5"-0-7.5" by 10ths on side bars. 0-180, 180-0 by 30' on three sides of the frame.
Alidade-Length 20.25" (51.4cm). Brass, graduated on upper surface 30-90, 25-90, 20-14, 16-11, 12-8. Also a diagonal scale.
Sight vanes-Two sight vanes, attached to alidade by brass screws, 4.8" (12.2cm) long. One vane has a vertical slit with rectangular aperture above (complete with thread), the other vane has a rectangular aperture (complete with thread) with a vertical slit above.
Compass-Dia. of bowl 5" (12.7cm). Wood frame which attaches to side of table. Paper card graduated to 32 points and to360 degs. There is a raised brass ring at edge of card also graduated to 360 degs.
Needle-Length 4" (10.2cm) blued steel with brass pivot cap at centre.
A brass tripod spigot is contained in box. In fitted wooden box 18 x 15.5 x 3.25" (45.7 x 39.4 x 8.9cm)
The box is marked NAV1442.2, the tripod mount is marked NAV1442.1 and the alidade is marked NAV1442.3. They can be found via the Whole/Part toggle. | Publisher: | "http://collections.rmg.co.uk/" | Subjects: | plane tables | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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