Gregorian reflecting telescope of 3-inch aperture by James Short

Made:
1753-1755 in London
maker:
James Short

Gregorian reflecting telescope of 3-inch aperture by James Short, London [138/878 = 12] (138th of 12 inch type out of 878 made) plus 1 spare eyepiece, no stand. [replica mahogany (wood) stand was made in workshops]

Details

Category:
Astronomy
Object Number:
1976-290
Materials:
brass, speculum metal, mahogany and incomplete
Measurements:
overall (estimate): 250 x 450 x 100 mm
type:
telescope - gregorian and telescope - reflecting
credit:
Shryane, F.M.

Parts

Speculum mirror for Gregorian telescope

Speculum mirror for Gregorian telescope

Speculum mirror of 3-inch aperture for Gregorian telescope by James Short, London [138/878 = 12].

Measurements:
overall: 12 x 75 mm
Materials:
speculum and complete
Object Number:
1976-290 Pt1
type:
components , concave mirrors and metal mirrors
Image ©
The Board of Trustees of the Science Museum
Gregorian 3-inch aperture reflecting telescope

Gregorian 3-inch aperture reflecting telescope

Gregorian reflecting telescope of 3-inch aperture by James Short, London [138/878 = 12] (138th of 12 inch type out of 878 made) plus 1 spare eyepiece, no stand. [replica mahogany (wood) stand was made in workshops] (see note).

Measurements:
overall: 330 mm x 480 mm x 140 mm, , 2.795kg
Materials:
copper (alloy) , speculum (alloy of copper and tin) , glass and steel (metal)
Object Number:
1976-290 Pt2
type:
instrument component , telescope - gregorian and telescope - reflecting
Image ©
The Board of Trustees of the Science Museum

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