Herschel's Mirror Grinder-polisher is a photograph by Sheila Terry which was uploaded on July 23rd, 2016.
Herschel's Mirror Grinder-polisher
Replica of the hand-operated, speculum grinding/polishing machine designed and constructed by William Herschel, circa 1780, to produce high-quality... more
by Sheila Terry
Title
Herschel's Mirror Grinder-polisher
Artist
Sheila Terry
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Photograph
Description
Replica of the hand-operated, speculum grinding/polishing machine designed and constructed by William Herschel, circa 1780, to produce high-quality parabolic mirrors for the many 7-foot reflector telescopes constructed in his workshop at New King Street, Bath. These small, parabolic mirrors, with an aperture of around 150mm (6-inches), were shaped and polished by Herschel from the castings that he made in speculum alloy. A 7-foot Newtonian-type reflector telescope, using a 6.2 inch diameter paraboloidal mirror, was used in Herschel's detailed stellar survey and led to his discovery of the planet Uranus in 1781.
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July 23rd, 2016
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