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H9893-1 Astronomical equipment, mural circle, brass, designed and made by Edward Troughton, London, England, 1807-1809, used at Parramatta Observatory, 1815-1825. Click to enlarge.

Mural circle and parts for telescope made by Edward Troughton, London, England, 1807-1809

Made
There are two main types of telescopes. One uses a curved reflecting mirror to capture an image of celestial bodies the other uses a refracting lens to gather the light. This mural circle was used in conjunction with a telescope and was set into a wall. It was then turned on an axle so the telescope could observe the stars as they passed through their meridian.

These are the remaining parts of the mural circle which arrived in Australia with Governor Brisbane in late 1821. They and presumably …

This object is part of

Summary

Object No.

H9893-1

Object Statement

Astronomical equipment, mural circle, brass, designed and made by Edward Troughton, London, England, 1807-1809, used at Parramatta Observatory, 1815-1825

Physical Description

Astronomical equipment, mural circle, brass, designed and made by Edward Troughton, London, England, 1807-1809, used at Parramatta Observatory, 1815-1825.

A flat, hollow, brass circle with numbers engraved around the outside edge. The circle is divided into two, each half being numbered from 0-180. There are four equidistant indentations on the inside edge of the circle and four equidistant holes in the surface of the ring.

Dimensions

Height

6 mm

Cite this Object

Harvard

Mural circle and parts for telescope made by Edward Troughton, London, England, 1807-1809 2021, Museum of Applied Arts & Sciences, accessed 21 September 2021, <https://ma.as/258797>

Wikipedia

{{cite web |url=https://ma.as/258797 |title=Mural circle and parts for telescope made by Edward Troughton, London, England, 1807-1809 |author=Museum of Applied Arts & Sciences |access-date=21 September 2021 |publisher=Museum of Applied Arts & Sciences, Australia}}