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Speculum metal prints
Showing 1 to 26 of 26
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Speculum metal disc
William Herschel
A Newtonian primary mirror of speculum metal with a focal length of 1ft 6ins
William Herschel
Telescope mirror
William Herschel
Newtonian primary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Cassegrain secondary mirror
William Herschel
Gregorian primary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Newtonian secondary mirror
William Herschel
Gregorian secondary mirror
William Herschel
Metal ingots
unknown
Speculum nauticum super navigatione maris occidentalis confectu, continens omnes oras maritimas Galliae, Hispaniae, and praecipuarum partium Angliae
Lucas Janz Waghenaer
Mirror polishing frame
unknown
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