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Gerard L'E. Turner [6]Gerard L'estrange Turner [1]
  1.  19
    An Astrolabe Attributed to Gerard Mercator, C. 1570.Gerard L'E. Turner & Elly Dekker - 1993 - Annals of Science 50 (5):403-443.
    The Istituto e Museo di Storia della Scienza, Florence, Italy, possesses an astrolabe with five latitude plates that is now attributed to the Duisburg workshop of Gerard Mercator. Although it is known that Mercator made instruments, this is the first surviving example to be identified. Another latitude plate is shown to come from the workshop of the Florentine, Giovan Battista Giusti. A seventh plate, possibly engraved by Rumold Mercator, provides the only known Mercatorian polar stereographic projection. The role of Egnazio (...)
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  2.  14
    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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  3.  21
    A Novel Italian-Hour Nocturnal by Michiel Coignet.Gerard L'E. Turner - 2006 - Annals of Science 63 (2):215-219.
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  4.  9
    The Government and the English Optical Glass Industry, 1650-1850.Gerard L'E. Turner - 2000 - Annals of Science 57 (4):399-414.
    The concept of a technical frontier in branches of experimental measurement, such as the resolution of the microscope, angular measure and time telling, has been around for more than 60 years. The purpose of this brief paper is to identify the technical frontier operating on the achromatic astronomical telescope, where a limiting factor of the resolution of fine detail was the quality of the optical glass available. The achromatically corrected objective is formed from two kinds of glass, the common crown (...)
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  5.  3
    The Italian-Hour Nocturnal.Gerard L'E. Turner - 2003 - Annals of Science 60 (3):249-268.
    The general view is that there is one type of nocturnal, which is universal, first illustrated in a printed book in 1524. Recently, a number of quite differently constructed nocturnals has come to light. Six of these were made at the very beginning of the sixteenth century by Falcono of Bergamo in northern Italy. One of them, with the initials of the inventor, may well be the prototype. Five more are closely similar. Five further nocturnals of the same type have (...)
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