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Speculum nauticum. : A looking glasse for sea-men: wherein they may behold a small instrument called the plain scale: wherby all questions nauticall, and propositions astronomicall are very easily and demonstratively wrought. Published for the use and benefit of such as will make good use of it
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The theory of Hadley's quadrant,, or the rules for the construction and use of that instrument demonstrated. By ... Mr. Ludlam
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