Reference numberPT/62/8/51
Previous numbersPT/62/8/2
TitlePhotograph, telescope speculum for Lord Rosse's telescope at Birr Castle, Ireland by unknown artist
DescriptionA view of the speculum on supporting levers supported on a cast iron rail carriage. The carriage is shown on a turntable situated to the north side of the Parsonstown 72-inch reflecting telescope, with the background screened off by a dark cloth. Details include the carriage's lime-boxes. The instrument, the largest reflecting telescope in the world when built, was at Birr Castle, Parsonstown, Ireland. The image is inscribed in pencil, verso 'Original which may assist in understanding the reduced copy' and 'Lord Rosse's Paper June/61'. An engraved version of this photograph was published in William Parsons' paper as figure 1 from plate 24.

Subject: Scientific Instruments / Astronomy

Published in Philosophical Transactions as 'On the construction of specula of six-feet aperture; and a selection from the observations of nebulæ made with them'.

Received by the Royal Society on 5 June 1861. Read 20 June 1861.
Physical descriptionAlbumen print, mounted on card
Access statusOpen
Related materialDOI: 10.1098/rspl.1860.0078
DOI: 10.1098/rstl.1861.0029
Related records in the cataloguePT/62/8
URL descriptionDigital version available on The Royal Society Picture Library
Fellows associated with this archive
NA8084Parsons; William (1800 - 1867); 3rd Earl of Rosse1800 - 1867
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