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An important and rare work. Classed as 'poor' because it lacks a folding plate with a stereographic projection and an engraved plate featuring sector. The volvelle is present (but is inserted as a plate rather than being cut out and pinned it in). It also lacks p89-208 of the Third Book of The Cross-Staff (the book on the use of lines). The stitching up to p 91 is failing and some pages are loose up to that point. Edmund Gunter (b Hertfordshire 1581) went to Westminster School and Christ Church Oxford. He took holy orders in 1614. His particular interest however was in mathematics and he was successful in securing the first ever post of Professor of Geometry at Oxford University. However his claim to be able to locate the position of the stars enraged the patron of this new post, Sir Henry Savile, and he was dismissed. His fortunes quickly changed when he won the patronage of the Earl of Bridgewater, who helped secure him the post of Professor of Astronomy in Gresham College, London in 1619. His career now established he proceeded to a series of outstanding works on geometry , including his treatises on the Sector, Cross-staff, Bow, Quadrant and other instruments. His collected works appeared in 1624, and this book is the 5th edition published 1674 (although in practice it is believed to be the 3rd). He is credited with the invention of a number of measuring devices, including Gunter's Chain, Quadrant and Scale, and also with inventing the words cosine and cotangent to represent the inverse of sin and tangent. Of particular worth was his development of the method of triangulation, in order to locate an object using fixed positions; which was of especial value to sailors. The value of his mathematical analyses to navigation is exemplified by two section of this book entitled ¿A description of the Tropicks¿ and ¿The Use of the Lines of Sines and Tangents in Navigation¿. This edition is particularly sought after because of its reworking by William Leybourn, and includes a work by Samuel Foster which developed part of Gunter's work on the Sector. In full leather binding with slightly newer spine and probably original boards. The binding itself is in good condition so it is likely that when the newer spine was added, it had already lost the final parts of the work. With decorative title page; title page; dedication to the Earl of Bridgewater 2pp; Letter from William Leybourn to the Reader 5pp; Note of subjects taught by Leybourn 1pp; Advert 1pp; title to first book (with small ink signature and a further crossed out ink signature); text with numerous diagrams and a small crumpled folding plate (the volvelle to be cut out and pinned in) pp1-156; title page to The Sector Altered by Samuel Foster (work first written in 1624 as an appendix to Gunter's Quadrant and then published in 1652); text pp 159-194; postscript 1pp; Title page The Cross Staff in 3 Books; book I pp 199-232; Book 2 pp 233-312; Book 3 pp 1-88 - pages 89-208 missing - these include the logarithm tables. Apart from the faults listed above, there is occasional staining and a little worming to the top margins at the beginning of the work. N° de ref. de la librería
Título: The Works of Edmund Gunter: Containing the ...
Editorial: A C for Francis Eglesfield
Año de publicación: 1673
Condición del libro: Poor
Edición: 5th or later Edition
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