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Date: |
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Description: | P SEVIN APARIS 1665
Pierre Seuin AParis 1665
Graduations-Semi-circle graduated 0-180, and 180-0, and carries a diagonal scale. The alidade 10.4" (26.5cm) long, has a fiducial edge at each end. A suspension ring is attached to upper part of semi-circle and there is a straight edge 11.2" (28.4cm) long at the lower part. A balla nd socket head and a square plate 4.25" x 4.25" (10.8 x 10.8cm) are attached to back of instrument.
Sights-There are location holes for two sight vanes in straight edge. Two sight vanes 1.4" (3.5cm) long, mounted on alidade, each having a hole (one with cross bar missing) with straight edge sights above.
Compass Dia. 3.6" (9.2cm) mounted at centre of instrument. Fitted with a narrow blued steel needle in form of an arrow 2.9" (7.3cm) long, with a brass pivot cap at centre. Graduated to 32 points and to 360 degrees.
AUDIT - object needs to be marked with its NAV number | Publisher: | "http://collections.rmg.co.uk/" | Subjects: | graphometers | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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