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RARE LUNETTE GRAPHOMETER made of brass. It consists of a fix…
See original version (French)
213
-
RARE LUNETTE GRAPHOMETER made of brass. It consists of a fix…
See original version (French)
Estimate €1,500 - €2,000
Voluntary lot
Description
RARE LUNETTE GRAPHOMETER
made of brass. It consists of a fixed semicircle graduated in degrees, at the centre of which is a compass under glass set within a circle engraved with an interlaced laurel pattern, supported by two winged dragons facing each other. On the semicircle is a fixed alidade with (removable) pinnules, as well as a spirit level. Above this is another alidade, which rotates about the central axis, fitted with pinnules and engraved with the inscription “Arçenal / Real do / Exercito” (translation: Royal Army Arsenal). Above this is a sighting telescope centred on the centre of the movable alidade; the telescope can be tilted along a graduated semicircle. The centre of the instrument (beneath the telescope’s base) is richly engraved with the royal coat of arms of Portugal within a rocaille cartouche. Below this is a fixing point.
Portugal, late 18th century or early 19th century.
Height (telescope horizontal): 21.5 cm – Width: 37.2 cm – Depth: 21.5 cm
(Visible damage and losses; mounted on a custom-made moulded wooden base)
Description:
Originally owned by the Arsenal of the Royal Portuguese Army, this rare instrument was designed to measure great distances, including those that were sometimes inaccessible. In particular, it enabled the creation of urban plans through the combination of several measurements obtained by triangulation. The finely engraved and openwork dragons on the base echo the supports of the Portuguese royal coat of arms, which are also engraved, reaffirming the official provenance of this exceptional object.
See original version (French)
Auto-translation. Refer to original language for legal validity.
Pictures credits: Contact the Auction House
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