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細節
NORWOOD, Richard (1590-1675). Trigonometrie or the Doctine of Triangles: Divided into two Bookes: The first shewing the mensuration of Right lined Triangles: The second of Sphericall: With the grounds and demonstrations thereof. Both performed by that late, and excellent invention of Logarithms Whereunto is annexed (chiefly for the use of Seamen,) A treatise of the application thereof in the three principall kindes of sailing. With certaine necessary Tables used in Navigation. London: William Jones, 1631.
4o (180 x 144 mm). Woocut diagrams, with the blank [*]2. Contemporary calf (covers slightly bowing, minor rubbing to joints). Provenance: Kiveton (early name on title); John Bridgett Thomas Osborne, and various other family members (names on preliminary blank); Boies Penrose (bookplate; his sale part II, Sotheby's London, 9 November 1971, lot 184).
FIRST EDITION, A VERY RARE AND FINE COPY of this highly important navigational manual, containing mathematical solutions to astronomical and navigational problems. "With a book like this in his hand there was now no reason why the navigator should not solve all problems of plane and Mercator's sailing logarithmically. Norwood had weaned logarithmical navigation from the lecture hall" (Waters). "A clear explanation of plane and spherical trigonometry is followed by a systematic demonstration of how to solve the standard navigational problems for the plain and Mercator's charts respectively, using the example of the voyage from the Lizard to the Summers Islands (Bermuda). For great circle sailing, given the latitude and longitude of the places of departure and arrival, the points where the great circle crosses a succession of meridians at a selected small interval, and the angles at which it crosses them, can be worked out trigonometrically, and plotted on Mercator's chart. The course can then be chosen to follow the circle as nearly as is convenient along a succession of rhumbs" (Taylor). Following the first edition of this work 7 other editions are recorded up to 1685. Adams & Waters 2764; Crone 168; STC 18692; Taylor Mathematical Practitioners 149; Waters The Art of Navigation in Elizabethan and Early Stuart Times pp. 480-487.
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FIRST EDITION, A VERY RARE AND FINE COPY of this highly important navigational manual, containing mathematical solutions to astronomical and navigational problems. "With a book like this in his hand there was now no reason why the navigator should not solve all problems of plane and Mercator's sailing logarithmically. Norwood had weaned logarithmical navigation from the lecture hall" (Waters). "A clear explanation of plane and spherical trigonometry is followed by a systematic demonstration of how to solve the standard navigational problems for the plain and Mercator's charts respectively, using the example of the voyage from the Lizard to the Summers Islands (Bermuda). For great circle sailing, given the latitude and longitude of the places of departure and arrival, the points where the great circle crosses a succession of meridians at a selected small interval, and the angles at which it crosses them, can be worked out trigonometrically, and plotted on Mercator's chart. The course can then be chosen to follow the circle as nearly as is convenient along a succession of rhumbs" (Taylor). Following the first edition of this work 7 other editions are recorded up to 1685. Adams & Waters 2764; Crone 168; STC 18692; Taylor Mathematical Practitioners 149; Waters The Art of Navigation in Elizabethan and Early Stuart Times pp. 480-487.