An extremely rare mid 18th-Century French brass astronomical ring dial, signed under one of the alidade arms Charot AParis , the meridian ring with sliding throne and suspension loop with scroll-shaped detail, engraved with 0-90° northern and southern latitude scales with 1° subdivisions, the vernier engraved on the throne, further engraved on both sides with latitudes of ten locations: Chandernagore 22° 51'; le Cap de Bonne Esperance 34° 40'; Pondicheri 11° 56'; Agra 26° 40'; Delhy 28° 20'; Surat 21° 10'; Madrast 13° 13'; Siam 14° 15' Goa 15° 51'; Paris....48°...51' The equatorial ring with an engraved hour scale of twice 1-12 hours in roman numerals with 5-minute subdivisions, the declination ring engraved with a 90°-0-90° scale and a half-Zodiac scale on each side, the latter with sigils, an alidade on each side each with three pinhole sights, vernier with 0-60 scale in each direction and scroll-shaped decorative support, with blued-steel headed screws thoughout -- 16.5cm. (6½in.) diameter See Illustrations
An extremely rare mid 18th-Century French brass astronomical ring dial, signed under one of the alidade arms Charot AParis , the meridian ring with sliding throne and suspension loop with scroll-shaped detail, engraved with 0-90° northern and southern latitude scales with 1° subdivisions, the vernier engraved on the throne, further engraved on both sides with latitudes of ten locations: Chandernagore 22° 51'; le Cap de Bonne Esperance 34° 40'; Pondicheri 11° 56'; Agra 26° 40'; Delhy 28° 20'; Surat 21° 10'; Madrast 13° 13'; Siam 14° 15' Goa 15° 51'; Paris....48°...51' The equatorial ring with an engraved hour scale of twice 1-12 hours in roman numerals with 5-minute subdivisions, the declination ring engraved with a 90°-0-90° scale and a half-Zodiac scale on each side, the latter with sigils, an alidade on each side each with three pinhole sights, vernier with 0-60 scale in each direction and scroll-shaped decorative support, with blued-steel headed screws thoughout -- 16.5cm. (6½in.) diameter See Illustrations
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
