Brass Cassegrain reflecting telescope of 3 inch aperture, with altazimuth mount, stand and accessories

Made:
1790-1835 in London
maker:
James Watson
Brass Cassegrain reflecting telescope by James Watson, London Brass Cassegrain reflecting telescope by James Watson, London

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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

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Brass Cassegrain reflecting telescope by James Watson, London
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Brass Cassegrain reflecting telescope by James Watson, London
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Brass Cassegrain reflecting telescope of 3 inch apertureby James Watson, London with altazimuth mount on a claw foot stand. Acessories include, a finder telescope, 2 eyepieces and a tin box for the speculum mirror.

Details

Category:
Astronomy
Object Number:
1921-576
Materials:
brass, speculum, iron, glass and complete
type:
telescope - cassegrain and telescope - reflecting
credit:
Mr Thomas H. Court

Parts

Case, for Cassegrain 3 inch aperture and 10 inch focal length reflecting telescope

Case, for Cassegrain 3 inch aperture and 10 inch focal length reflecting telescope

Case for Cassegrain reflecting telescope of 3 inch aperture and 10 inch focal length by Watson, on an altazimuth stand with a folding claw foot tripod. Acessories include, a finder telescope, 2 eyepieces and a tin box for the speculum mirror.

Materials:
wood , iron and complete
Object Number:
1921-576 Pt1
type:
case - container
Brass Cassegrain reflecting telescope of 3 inch apertureby James Watson

Brass Cassegrain reflecting telescope of 3 inch apertureby James Watson

Brass Cassegrain reflecting telescope of 3 inch apertureby James Watson, London with altazimuth mount on a claw foot stand. Acessories include, a finder telescope, 2 eyepies and a tin box for the speculum mirror.

Measurements:
depth: 250mm
height: 400mm
width: 270mm
Materials:
glass , brass (copper, zinc alloy) and speculum (alloy of copper and tin)
Object Number:
1921-576 Pt2
type:
instrument component , telescope - cassegrain and telescope - reflecting