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Product images of Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland
Product details Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland
Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland
Plate 24 figure 4 from the paper "On the construction of specula of six-feet aperture; and a selection from the observations of nebulae made with them", by William Parsons, 3rd Earl of Rosse, Philosophical Transactions of the Royal Society, volume 151 (1861) pp.681-746. A front view of the cast iron grinding tool used to produce the speculum of the reflecting telescope at Birr Castle, Parsonstown. The face has straight cast grooves forming squares and circular, lathe-cut groves The tool is shown suspended on gimbals from a pulley. The image is inscribed in pencil, verso "Original Lord Rosse's paper".
Original: albumen print. 1861
- Image ref: RS-9080
- The Royal Society