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Date: |
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Description: | 1718
Made by Tho Wright Instrument Maker to eY PRINCE
The Orrery & Globe// Thomas Wright//at the Orrery & Globe next the Globe & Marlborough Head ?Tavern in Fleet St// LONDON. Mathematical Instrumt. Mkaer//to his royal Highns GEORGE Prince of WALES Makes and Sells all sorts of Mathematical//Instruments for Sea & Land According//to the best & latest Improvements
Graduations- Circle graduated quadrantally in degrees and to 360 degs. Vernier scale at one end of alidade 0-60.
Sights-One detachable sight vane 4.9" (12.4cm) long mounted on circle, it has a vertical slit with a rectangular aperture above. Two detachable sight vanes 4.5" (11.4cm) long mounted on alidade, one sight with a vertical slit and rectangular aperture above, the other with a rectangular aperture and vertical slit above.
Compass-Dia. 5.7" (14.5cm) mounted at centre of instrument. Fitted with a narrow blued steel needle 4.5 " (11.4cm) long, with a brass pivot cap at centre. Graduated to 16 points, quadrantally in degrees and anti-clockwise to 360 degs.
In wooden box 13 x 13 x 3.5" (33 x 33 x 8.9cm)
AUDIT - object needs to be marked with its NAV number. Four unnumbered parts. Ex T.21. | Publisher: | "http://collections.rmg.co.uk/" | Subjects: | circumferentors | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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