Gregorian reflecting telescope, 1748-1788

Made:
1748-1788 in London
maker:
Thomas Short

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Gregorian telescope with 3-inch speculum mirror, tube stopper and 2 eyepieces by Thomas Short, London in case.

Dated to 1747--68, this reflecting telescope uses the Gregorian optical configuration. First proposed by James Gregory in 1663 it produces upright images. This is a convenience for a telescope that was as likely to be used for terrestrial viewing as for looking for objects in the sky. Made by the London instrument maker, Thomas Short the telescope has a brass tube. The claw-foot tripod stand allows the telescope to be used on a table, while focussing is achieved by moving the tiny mirror at the top of the tube. To aid the finding of objects being observed the telescope is provided with naked-eye viewing sights.

Details

Category:
Astronomy
Object Number:
1928-872/1
Materials:
brass (copper, zinc alloy), complete, glass and speculum (alloy of copper and tin)
Measurements:
overall (as displayed): 475 mm x 570 mm x 265 mm, 3.892 kg
overall: 540 x 500 x 280 mm
type:
telescope - reflecting
taxonomy:
  • disciplines
  • disciplines
  • science
  • natural sciences
  • physical sciences
  • component - object
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • telescope
  • telescope - reflecting
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • telescope
credit:
Mr Thomas H. Court