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Description: | Boxwood body with brass fittings. A central slot runs the length of the boxwood body, in which a steel or similar material helical screw carries index pointers on each side of the slot and on each face of the rule. A brass serrated wheel 20mm in diameter sits in two brass brackets at the end of the boxwood scale: rotation of the wheel causes the pointers to move along the helical screw via a crown wheel and pinion.
The scales are labelled by nationalities:
Russie 0?25
Italie 49?27 and 20K
Suisse 40?22 and 86400
Austeriche
Russie 1?100k
Angleterre 0?15 E; 30 ? 15 (i.e. in reverse direction )
Obverse:
Metre 1-9?110?130-150?250
France 1?20
Prussie 40?20 (i.e. in reverse direction)
Belgique
Russie 1?15K 21 800
Austriche 2?34; 68 ? 36 ( i.e. in reverse direction)
Inscription on brass bracket: Institute Geographique de France, C.H. Delegrave, 36 Rue des Ecoles
Contained in a pink leather or leatherette covered case, lined with pink material, with two brass catches.
Also with an instruction book (135 x 200 mm) with yellow paper covers, Rumbographie', 8 pages plus folding page of diagrams.
Instrument destine aux navigations. Se trouve a Brest, chez M. SChiavetti ? Bellien, opticien, Rue d?Aiguillon 19 1854
AUDIT - two unnumbered parts.
Condition: all sound, some fading of case covering.
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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