Gregorian reflecting telescope of 2 1/2 inch aperture and 18 inch focal length by Benjamin Martin

Made:: 1738-1777 in London

maker:: Benjamin Martin

Gregorian reflecting telescope of 2 1/2 inch aperture and 18 inch focal length by Benjamin Martin, London, on an altazimuth stand with a folding claw foot tripod and oak case.

Details

Category:: Astronomy

Object Number:: 1919-326

Materials:: brass (copper, zinc alloy), glass, iron, speculum (alloy of copper and tin) and wood (unidentified)

Measurements:: length 260 mm
width 480 mm
height 460 mm

type:: telescope - gregorian and telescope - reflecting

credit:: Mr Thomas H. Court

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Parts

Case for Gregorian reflecting telescope of 2 1/2 inch aperture and 18 inch focal length by Benjamin Martin

Case for Gregorian reflecting telescope of 2 1/2 inch aperture and 18 inch focal length by Benjamin Martin, London, on an altazimuth stand with a folding claw foot tripod.

Measurements:: case: 100 x 480 x 185 mm

Materials:: oak , iron and complete

Object Number:: 1919-326 Pt1

type:: component , storage boxes and instruments