mayer johann tobias forbes eric (3 résultats)

Hardcover. 24 x 16 cm. Octavo. 118pp. Red cloth in dust jacket. Tanning to jacket spine. Previous owner's bookplate on front fixed endpaper. Old price stamp on front free endpaper. Near Fine in Near Fine dust jacket.

Hardcover. 24 x 16 cm. Octavo. 166pp. Frontispiece. Brown cloth in dust jacket. Previous owner's bookplate on front fixed endpaper. Old date stamp on front free endpaper. Near Fine in Very Good dust jacket.

Soft cover. Etat : Near Fine. No Jacket. 1st Edition. First Edition. 3 leaves, 104 pp; 17 figs. Original wrappers. Near Fine. Arbeiten aus der Niedersächsischen Staats- und Universitätsbibliothek Göttingen Band 11. Introduction: 7-31. Latin text: 32-63. English translation: 63-104. 'Mayer also undertook to devise a method for finding geographical coordinates independently of astronomical observations. In so doing he arrived at a new theory of the magnet, based, like his lunar theory, on the principles of Newtonian mechanics. This theory represented a convincing demonstration of the validity of the inverse-square law of magnetic attraction and repulsion, and antedated Coulomb's well-known verification of that law by some twenty-five years. Mayer's manuscripts on this theory and its application to the calculation of the variation and dip of a magnetic needle are among those that went virtually unnoticed after his death. . . . E. G. Forbes, ed., The Unpublished Writings of Tobias Mayer, 3 vols. (Göttingen, 1972), contains Mayer's writings on astronomy and geography, his lecture notes on artillery and mechanics, and [in the volume offered here] his theory of the magnet and its application to terrestrial magnetism' (Forbes in D.S.B. IX: 234-5).