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"ROBINSON, THOMAS RODNEY & THOMAS GRUBB. - THE GREAT MELBOURNE TELESCOPE.
Reference : 42671
(1870)
Description of the Great Melbourne Telescope.
(London, Taylor and Francis, 1870). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1869 - Vol. 159 - Part I. Pp. 127-161 and 10 lithographed plates, showing the telescope and its parts. A few small weak brownspots to top of some plates.
First printing of the detailled description of the Great Melbourne Telescope, by Robinson, member of the commitee and Thomas Grubb, the constructor. With it a number of importent observations of Nebulae were carried out. For 20 years it was the largest in the world, and it was the first instrument to document gravitational lens light refraction. The telescope was destroyed during the bush fires of January 2003.""The construction of the grand instrument was entrusted to Mr. Grubb, F.R.S., of Dublin, Ireland. At the Commencement of the year 1868 the telescope was completed, and examined by the Commitee of the Royal Society, made up of Lord Rosse, Dr. Robinson and Warren de la Rue. Intheir report they expressed their opinion that the equatorial was a masterpiece of astronomical mechanism.""
Bollettino del Centro internazionale A. Beltrame di Storia dello spazio e del tempo
Brugine, 1984, in-4, 162, (4)pp, br, N¡ 3-4 de cette revue illustrée dont les pp. 10 à 62 sont consacrées à l'histoire du téléscope Couverture rigide
Bon 162, (4)pp.
MUDGE, JOHN. - TELESCOPE MAKING - NEWTON'S PREDICTION FULLFILLED.
Reference : 49416
(1777)
Directions for making the best Composition for the Metals of reflecting Telescopes" togethe with a Description of the Process for grinding, polishing, and giving the great Speculum the true parabolic Curve. Read Feb. 27. March 6. and 13. 1777.
(London, W. Bowyer and J. Nichols, 1777). 4to. Extracted from ""Philosophical Transactions"", Year 1777. Vol. 67 - Part I. Pp. 296-349 and 1 folded engraved plate. Wide-margined, clean and fine.
First printing of Mudge's importent paper in which he describes his new mechanical methods of making parabolic mirrors, and introducing af new composition of the alloy. Like his modern counterparts, Mudge created an apparatus to minimize the role of the technician and the possibility of errors. ""On 29 May 1777 Mudge was elected a Fellow of the Royal Society, and in the same year was awarded the Copley medal for his ‘Directions for making the best Composition for the Metals for reflecting Telescopes"" together with a Description of the Process for Grinding, Polishing, and giving the great Speculum the true Parabolic Curve,’ which were communicated by the author to the society, and printed in the Philosophical Transactions (1777, lxvii. 296). The ‘Directions’ were also issued separately by Bowyer (London, 1778). Sir John Pringle, the president, in making the presentation, remarked that Isaac Newton had predicted the role of mechanical devices in making parabolic mirrors.""(Wikipedia).
