Mirror of speculum metal in tin cell

Made:
1780-1820 in England
maker:
William Herschel

Nine inch mirror of speculum metal (exact diam" 8 15/16 in) in tin cell with close fitting cover 9 1/2" diam, 1 1/2" deep, focal length 10' 1", cell and cover each painted " J"

Details

Category:
Astronomy
Object Number:
1925-464
Materials:
speculum metal and tin
type:
components, concave mirrors, metal mirrors and astronomical instruments
credit:
Mr John Herschel-Shorland

Parts

Related Objects

Colour print of the visible surface of the Sun

One of four photographs in window mounts showing an enlarged portions of the Sun's visible disc

One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph

One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph

Photograph of Drawing of Solar Chromosphere

Photograph of Drawing of Solar Chromosphere