Photographs, Lord Rosse's telescope at Birr Castle, Ireland, by [Mary Parsons, Countess of Rosse?] and unkown artist[s] Reduced versions of images and cut stereoscopic views of the telescope arranged on a backing board for the engraver. The images are numbered and overwritten with key letters in ink. The paper contained larger versions of most of these images, however figures 10-11 [universal joint bearing the main tube] are only present on this collected sheet. Engraved versions of these photographs were published in William Parsons' paper as figures 1-11 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. [1861]