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

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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] . Presented to Royal Astronomical Society in 1845 by Mrs Sommerville to whom it was left by Mrs Dixon, Smeaton's daughter.

Materials:: wrought iron , brass (copper, zinc alloy) and glass

Object Number:: 1931-347 Pt1

type:: instrument component and telescope - refracting

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.