image MS_257_1838
Image number: RS.9291
Credit: © The Royal Society
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Mirror cell for the Great Melbourne Telescope speculum


ca. 1867

Object type

Archive reference number




height (print): 90mm
width (print): 76mm


Content object


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.

Object history

This image of Grubb’s design was reproduced as a lithograph in Correspondence concerning the Great Melbourne Telescope. In three parts: 1852-1870 (London, Royal Society, 1871), plate III figure 13 and described in Thomas Romney Robinson’s “Abstract” description of the telescope, part III, pp.49-59.8 with a key to the print.

Associated place

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   > Europe
      > Ireland
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   > Oceania
      > Australia