8 July 1999
A MID-18TH CENTURY GILDED BRASS SURVEYING SWINGING ARM PROTRACTOR
Signed 'GEMACHT DURCH JOHANN FRIDRICH FRANCKEN ANNO 1642'
The base line with two folding sights, the hinges with scroll decorated supports, the protractor scale with punched numerals, the swinging arm with two additional folding sights similarly mounted, butterfly-wing tightening screw, the centre locating circle engraved with entwined flowers, the reverse undecorated
Rothschild inv. no. AR1737.
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E. Zinner, Astronomische Instrumente des 11. bis 18. Jahrhunderts, p.315.
Please note that the catalogue description of this lot should date the instrument to the mid-17th Century
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