Elliptical plane mirror (diagonal flat for Newtonian telescope) minor axis 1 1/2"

Made:
1780-1820 in England
maker:
William Herschel

Elliptical plane mirror (diagonal flat for Newtonian telescope) minor axis 1 1/2", major axis 2" in (full) soldered in usual way to circular brass disc, cylindrical cover of brass 1 3/4" deep, cover of brass 1 3/4" deep, cover and brass disc inscribed 1 "A4"

Details

Category:
Astronomy
Object Number:
1925-465
Materials:
speculum and brass
type:
components, flat mirrors, metal mirrors and astronomical instruments
credit:
Mr John Herschel-Shorland