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John Blagrave
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John Blagrave : The Mathematical Jewel, Shewing the making, and most excellent use of a singuler Instrument so called ... The use of which Jewel ... leadeth ... through the whole Artes of Astronomy, Cosmography, Geography, Topography, Navigation, Longitudes ...
'Next to [John] Balgrave's modest prefatory poem [in "The Mathematical Jewel" (1585)] "The Authour in his own defence", [Gabriel] Harvey comments: "An Youth, & no University-man. The more shame for sum Doctors of Universities, that may learn of him".'
