Photograph, Lord Rosse's telescope at Birr Castle, Ireland by [Mary Parsons, Countess of Rosse?] The great telescope seen from the south-west, showing the machinery of the second and third galleries. Beside the telescope is a group of six figures including William Parsons, the Earl of Rosse with three ladies and two of his children; Randal Parsons standing and Charles Algernon Parsons seated on the telescope's steps. This view has been pasted onto a supporting card with three other photographic figures from the same plate. This monoscopic view from a stereoscopic photograph was used to produce the engraving that was published in William Parsons' paper as figure 6 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. [1857]