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Description: | The basic trigometre design consists of two graduated arms pivoting at the end of a fixed base. In Danfrie's version, each arm carries a graduated arc for measuring the angles formed with the fixed base. The distance to a point can be computed using the similarity of triangles or the sine theorem. Instrument was named by Philippe Danfrie (c. 1532-1606) in 'Traict� de l'usage du Trigometre avec le quel on peut facilement mesurer sans subjection d'Arithmetique' (Paris, 1597).
Original tooled leather case and companion scales.
Inscription. Ex T.63. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | motif: Cypher Barberini trigometers | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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