Nine inch mirror of speculum metal (exact diam" 8

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:
metal mirrors
credit:
Mr John Herschel-Shorland