Twelve inch astronomical quadrant by Bird

Made:: 1760-1769 in London

maker:: John Bird; John Troughton

Twelve inch astronomical quadrant by Bird

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Twelve inch astronomical quadrant by Bird
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Twelve inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769, at Schiehallion 1774-76, with case and key, subsequently repaired and redivided by "Troughton" engraved "R.S 63" on stand with 4 levelling screws, cleaned and relacquered, October 1951

Details

Category:: Astronomy

Object Number:: 1900-138

Materials:: brass and steel

Measurements:: overall: 640 x 430 x 250 mm

type:: quadrant - optical and instrument case

credit:: The Royal Society

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