Twelve inch astronomical quadrant by Bird

Made:
1760-1769 in London
maker:
John Bird
and
John Troughton
Twelve inch astronomical quadrant by Bird

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

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

Parts

John Bird's Twelve inch astronomical quadrant

John Bird's Twelve inch astronomical quadrant

Twelve inch astronomical quadrant by Bird, employed in the observations of the transit of Venus in 1769, at Schiehallion 1774-76,

Materials:
brass and threaded rods, steel
Object Number:
1900-138 Pt2
type:
optical quadrant - measuring device