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H10259 Speculum mirror, for reflecting telescope, copper / tin / glass / wood, Sir William Herschel, England, 1773-1822. Click to enlarge.

Speculum mirror for reflecting telescope made by Sir William Herschel

Made
There are two main types of telescopes. One uses a curved reflecting mirror to capture an image of the astral bodies the other uses a refracting lens to magnify its image. This metal speculum mirror was made for use in an early reflecting telescope and were usually made from composition of two parts copper to one part tin.

These early mirrors were made before the invention of technologies which could place a silvered mirror surface on glass and were instead made entirely from metals, mainly …

Summary

Object No.

H10259

Object Statement

Speculum mirror, for reflecting telescope, copper / tin / glass / wood, Sir William Herschel, England, 1773-1822

Physical Description

Astronomical equipment, speculum mirror for reflecting telescope, copper / tin / glass / wood, made by Sir William Herschel, England, 1773-1822

A large and heavy circular mirror, brass bound and fixed into a wooden box which is tapered to the front. It includes clear glass cover held in place by screws. Observatory stock number 356.

Marks

No marks

Dimensions

Height

150 mm

Width

290 mm

Depth

320 mm

Weight

80 kg

History

Notes

Said to have been made & used by Sir William Herschel and given to his friend, the father of Dr Brissenden. Then passed to W.G. Rendall whose daughter V. Rendall donated it to the Sydney Observatory.

Source

Credit Line

Ex-Sydney Observatory stock, 1984

Acquisition Date

25 June 1984

Cite this Object

Harvard

Speculum mirror for reflecting telescope made by Sir William Herschel 2021, Museum of Applied Arts & Sciences, accessed 28 July 2021, <https://ma.as/231971>

Wikipedia

{{cite web |url=https://ma.as/231971 |title=Speculum mirror for reflecting telescope made by Sir William Herschel |author=Museum of Applied Arts & Sciences |access-date=28 July 2021 |publisher=Museum of Applied Arts & Sciences, Australia}}