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Unidentified photographer
Mirror cell for the Great Melbourne Telescope speculum
1867 (ca)
Albumen print
The Royal Society
Product code: RS-9291
LL/58675
Study of the system of "equilibrated levers" made by Thomas Grubb (1800-1878), devised for the Armagh Cassegrain telescope and applied to the Great Melbourne Telescope's twin speculum mirrors.
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LuminousLint 
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