Heliostat, c. 1752.
- maker:
- Jeremiah Sisson
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Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Heliostat, made by Jeremiah Sisson, London, England, 1747-1757
Heliostat, c. 1752. A heliostat keeps the rays of the Sun in one direction during solar observation. This instrument was attached to the front of a telescope. The Sun's rays were reflected from the lower mirror to the upper fixed mirror from where they were reflected down the telescope tube. The angle of the lower mirror was set for the latitude, and was rotated by hand to compensate for the movement of the Sun. This instrument was made by Jeremiah Sisson, and could have been used by Dr. Stephen Demainbray (1710-1782), an 18th century lecturer on experimental philosophy.
Details
- Category:
- King George III
- Object Number:
- 1927-1195
- Materials:
- brass, speculum metal, steel and glass
- Measurements:
-
overall: 260 mm x 330 mm x 335 mm, 10.31 kg
- type:
- heliostats
- copyright:
- Unlinked Name
- credit:
- King's College, London
