Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland Anonymous

Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland by Anonymous

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Telescope speculum grinding tool for Lord Rosse's 72-inch telescope at Birr Castle, Ireland by Anonymous zoom

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 reference: RS-9080

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