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  1. An Examination of Two Groups of Georg Hartmann Sixteenth-Century Astrolabes and the Tables Used in Their Manufacture.John P. Lamprey - 1997 - Annals of Science 54 (2):111-142.
    Summary Examples of two groups of astrolabes manufactured by Georg Hartmann (1489?1564) were examined for design and manufacturing accuracy. Study of the instruments indicates that Hartmann was a precision manufacturer and early user of workshop production techniques. Hartmann's instruments and written instructions were directly influenced by the writing of Johann Stöffler (1452?1531), and the astrolabes and work of Regiomontanus (1436?76).
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  • The Three Astrolabes of Gerard Mercator.Gerard L'E. Turner - 1994 - Annals of Science 51 (4):329-353.
    In a paper published in volume 50 of Annals of Science an astrolabe at the Istituto e Museo di Storia della Scienza, Florence, was attributed to the hand of Gerard Mercator, c. 1570, when his workshop was in Duisburg. This was the first scientific instrument by Mercator to be identified. Since then two further astrolabes by Mercator have been identified, one of them bearing his monogram: GMR. They belong to the Städtische Kunstsammlungen, Augsburg, and the Moravian Gallery, Brno. All three (...)
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