Refracting telescope of 1 1/2-inch aperture and 36-inch focal length

Made:
1770 in London
maker:
John Smeaton

Refracting telescope of 1 1/2-inch aperture and 36-inch focal length by John Smeaton on an adjustable equatorial mounting with a tripod stand. The telescope is fitted with an integral filar micrometer [RAS No.7] . Presented to Royal Astronomical Society in 1845 by Mrs Somerville to whom it was left by Mrs Dixon, Smeaton's daughter.

Details

Category:
Astronomy
Object Number:
1931-347
Materials:
stand, wrought iron, tube & mounting, brass and optics, glass
Measurements:
overall (estimate): 700 x 1000 x 430 mm
type:
telescope - refracting, equatorial instrument and filar micrometer
credit:
Royal Astronomical Society

Parts

Refracting telescope of 1 1/2-inch aperture and 36-inch focal length by John Smeaton [RAS No.7]

Refracting telescope of 1 1/2-inch aperture and 36-inch focal length by John Smeaton [RAS No.7]

Refracting telescope of 1 1/2-inch aperture and 36-inch focal length by John Smeaton [RAS No.7] . Presented to Royal Astronomical Society in 1845 by Mrs Sommerville to whom it was left by Mrs Dixon, Smeaton's daughter.

Filar micrometer, from John Smeaton's refracting telescope

Filar micrometer, from John Smeaton's refracting telescope

Filar micrometer, part of refracting telescope by John Smeaton on equatorial mounting with stand [RAS No.7] . Presented to Royal Astronomical Society in 1845 by Mrs Sommerville to whom it was left by Mrs Dixon, Smeaton's daughter.

Measurements:
overall: 85 x 270 x 150 mm
Materials:
brass , steel , rosewood , glass and complete
Object Number:
1931-347 Pt2
type:
instrument component and filar micrometer