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A study of the accuracy of scale graduations on a group of European astrolabes

Pages 473-488 | Received 30 Apr 1983, Published online: 23 Aug 2006

  • Chapman , Allan . 1983 . The Design and Accuracy of some Observatory Instruments of the Seventeenth Century . Annals of Science , 40 : 457 – 471 .
  • Chaucer , Geoffrey . 1957 . “ A Treatise on the Astrolabe ” . In The Works of Geoffrey Chaucer Edited by: Robinson , F.N. 544 – 563 . Cambridge, Mass. see p. 545, sections 7–8. D.J. de Solla Price, The Equatorie of the Planetis (Cambridge, 1955), which is a study of Peterhouse MS 75.1.
  • Gunther , R.T. 1932 . Astrolabes of the World Vol. 2 , Oxford Henri Michel, Traité de l'Astrolabe (Paris, 1947). For a bibliography, see F. R. Maddison, ‘Early Astronomical and Mathematical Instruments. A Brief Survey of Sources and Modern Studies’, History of Science, 2 (1963), 17–50.
  • Chaucer . 1957 . “ A Treatise on the Astrolabe ” . In The Works of Geoffrey Chaucer Edited by: Robinson , F.N. 545 – 545 . Cambridge, Mass. speaks of quadrant dividing. Similar vague instructions appear in the Latin treatise, ‘Un traité de l'astrolabe du XV siècle’, edited by Henri Michel, Homenaje a Millas-Vallicrosa, II, (Barcelona, 1956), Cansejo Superior de Investigaciones Cientificas; it is recommended ‘…quatorum divedetur in 90 equales partes per 5as et 5as distinctas’, p. 64, section 131r.
  • de Solla Price , Derek J. 1975 . Gears from the Greeks; the Antikythera Mechanism New York also published in Transactions of the American Philosophical Society, new series 64, part 7 (November, 1974), pp. 18–22.
  • Fale , Thomas . 1593 . Horolographia 1 – 1 . London Though drawings and instructions for the construction of various dials are known to exist from at least c. 1450, i.e. Bodley MS. 68, reproduced by R. T. Gunther, Early Science in Oxford, (Oxford, 1923), II, 38–9, they do not describe the drawing of astronomical angular graduations. For early dialling accounts, see D. J. de Solla Price, ‘The Little Ship of Venice—a Middle English Instrument Tract’, Journal of the History of Medicine, 15 (1960), 399–407. Also A. W. Fuller, ‘Universal rectilinear dials’, Mathematical Gazette, 41 (1957), 2–24.
  • Chardin , J. 1686 . Voyages London Chardin's description of the Persian astrolabists was reprinted by H. Michel, ‘Méthodes de tracé et d'exécution des Astrolabes persans’, Ciel et Terre, 57th year, part 12 (December, 1941), 481–96.
  • Michel . 1686 . Voyages 495 – 495 . London
  • Museum of the History of Science, Oxford, Accession no. 69–51. No attempt has been made to measure the accuracy of this instrument because of the obvious crudity of its graduations. I am not aware of any European dasturs that have survived, although in Hooke's Robert Animadversions … on Hevelius London 1674 14 14 the use of a 10-foot dividing plate is mentioned.
  • For an exhaustive study on the nature of this instrument, see North John A Post-Copernican Equatorium Physis. Rivista internazionale di Storia della Scienza 1969 11 418 457

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