Nine inch mirror of speculum metal (exact diam" 8 15/16 in) in tin cell with close fitting cover 9 1/2" diam

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

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