Reference numberMOB/033
TitleAstronomical quadrant by John Bird
ArtistBird, John
Description12-inch brass astronomical quadrant, comprising a piece of metal in the shape of a quarter circle and a telescope. Supported by a long neck and four-feet base. Inscribed 'RS 62' in a number of places and 'J. Bird London' along the curved edge of the quarter circle.

Employed in the observations of the transit of Venus in 1769, at Schiehallion 1774-76
Extent1 instrument, parts
FormatScientific Instrument
Access statusOpen
Administrative historySaid to have been used by Captain James Cook during his observation of the transit of Venus in Tahiti. This quadrant design incorporated innovations to reduce observational inaccuracies, as described by John Bird in his Pamphlet 'The Method of Dividing Astronomical Instruments…' (London, 1767)
ProvenanceExact provenance unknown
URL descriptionDigital version available on The Royal Society Picture Library
Fellows associated with this archive
NA8183Cook; James (1728 - 1779)1728 - 1779
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