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A rare Benjamin Martin brass universal dial or portable equatorial instrument, English, circa ...
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London, United Kingdom
Beschreibung
A rare Benjamin Martin brass universal dial or portable equatorial instrument, English, circa 1780, signed G Wright Invt. Martin London Fecit, the silvered ring is divided 0-90 degrees and is held in a clamp with vernier scale, pivoted inside this ring is a second ring with a cross bar carrying sights, surmounted by a silvered disc at the top with 24 hour scale subdivided into four minute intervals, the circular base is mounted with two spirit levels and raised on four levelling screw feet, 300mm x 190mm x 170mm Footnotes: For similar instruments see Wynter & Turner, Scientific Instruments, Studio Vista 1975, fig.147. Oxford Museum of the History of Science, Inv. no. 34992 Provenance Stuart Talbot, August 2009 Private Collection For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing
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A rare Benjamin Martin brass universal dial or portable equatorial instrument, English, circa 1780, signed G Wright Invt. Martin London Fecit, the silvered ring is divided 0-90 degrees and is held in a clamp with vernier scale, pivoted inside this ring is a second ring with a cross bar carrying sights, surmounted by a silvered disc at the top with 24 hour scale subdivided into four minute intervals, the circular base is mounted with two spirit levels and raised on four levelling screw feet, 300mm x 190mm x 170mm Footnotes: For similar instruments see Wynter & Turner, Scientific Instruments, Studio Vista 1975, fig.147. Oxford Museum of the History of Science, Inv. no. 34992 Provenance Stuart Talbot, August 2009 Private Collection For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing
Instruments of Science and Technology
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Ort der Versteigerung
Montpelier St Knightsbridge
London
United Kingdom
SW7 1HH
United Kingdom
...
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