Optical instrument, astronomical star diagonal, metal / glass, used by Sydney Observatory, made by T Cook and Sons Limited, England, 1897-1922. An astronomical star diagonal for use with an 11 1/2" refractor. The star diagonal consists of a central brass cylinder containing an angled mirror. There is a hole in the side of the central cylinder into which another brass cylinder has been fixed at a right angle. An additional brass cylinder has been fixed with three screws into the open top of the central cylinder.
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(Accession num: H10295)
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