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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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