Credit: © The Royal Society
Image number: RS.9291
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Mirror cell for the Great Melbourne Telescope speculum
Date
ca. 1867
Object type
Archive reference number
Material
Technique
Dimensions
height (print): 90mm
width (print): 76mm
width (print): 76mm
Subject
Content object
Description
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