Twelve-inch quadrant by John Bird, with case

Made:
1760-1769 in London
maker:
John Bird
Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container) Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container) Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container) Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container) Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container) Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container) Twelve-inch quadrant by John Bird, with case (quadrant - optical; case - container)

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

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

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

Buy this image as a print 

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

License

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

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

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

Buy this image as a print 

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

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

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

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Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group Collection
© The Board of Trustees of the Science Museum

Twelve-inch quadrant on pillar stand with two plumb bobs, two glass beakers and two detachable reading microscopes in mahogany case, by John Bird, Strand, London, England, 1760-1769. This type of quadrant was used by Lieutenant (later Captain) James Cook during his first voyage of exploration aboard HMS Bark Endeavour (1768–1771).

Quadrants such as these were used to measure the altitudes of the Sun and stars. Lieutenant James Cook took an instrument similar to this – possibly this very one – on his expedition to the South Pacific island of Tahiti, from where he was to observe the transit of Venus across the Sun in 1769. Upon arriving on the island, Cook’s party used their quadrant to set the time of their astronomical regulator clock, and to determine precisely the position of their observatory.

Details

Category:
Astronomy
Object Number:
1876-572
Materials:
brass, glass and mahogany
Measurements:
overall (Object total): 640 mm x 450 mm x 270 mm,
overall (quadrant height only): 304.8 mm
type:
quadrant - optical and case - container
credit:
Caulfield, Richard; Lecky, Robert John; Lecky, John; Royal Cork Institution

Parts

Twelve-inch quadrant by John Bird

Twelve-inch quadrant on pillar stand with two plumb bobs, two glass beakers and two detachable reading microscopes, by John Bird, Strand, London, England, 1760-1769. This instrument has its original mahogany case. This type of quadrant was used by Lieutenant (later Captain) James Cook during his first voyage of exploration aboard HMS Bark Endeavour (1768–1771).

More

Quadrants such as these were used to measure the altitudes of the Sun and stars. Lieutenant James Cook took an instrument similar to this – possibly this very one – on his expedition to the South Pacific island of Tahiti, from where he was to observe the transit of Venus across the Sun in 1769. Upon arriving on the island, Cook’s party used their quadrant to set the time of their astronomical regulator clock, and to determine precisely the position of their observatory.

Materials:
brass and glass
Object Number:
1876-572/1
type:
quadrant - optical
Image ©
The Board of Trustees of the Science Museum
Mahogany case with accessories for 12-inch Quadrant by John Bird

Mahogany case with accessories for 12-inch Quadrant by John Bird

Mahogany case with accessories for 12-inch Quadrant on pillar stand, by John Bird, London, England, 1760-1769.

Materials:
brass , glass and mahogany
Object Number:
1876-572/2
type:
case - container
Beaker from twelve-inch quadrant by John Bird

Beaker from twelve-inch quadrant by John Bird

Glass beaker from twelve-inch quadrant, by John Bird, Strand, London, England, 1760-1769.

Object Number:
1876-572/3
type:
beaker