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Author: VENING MEINESZ, F.A.

**Title: Theory and practice of pendulum observations at sea. AND 2) Idem, Theory and practice of pendulum observations at sea. Part II. Second order corrections, terms of Browne and miscellaneous subjects.**

Description: Delft, Technische Boekhandel en drukkerij Waltman Jr., 1929. - 1941. 4to. In 2 vols. W. 9 plus 6 pls. Some diagrs. in the text. Original green publ. cloth. (Vol. I, upper cover some discol.). (VII, 95, I (Blank) pp.). (Laid in a letterpress compliment card 'Aangeboden door de Rijkscommissie voor Graadmeting en Waterpassing' / 'Envoi de la commission Géodésique Néerlandaise'). Complete set of 2 vols. DSB vol. XIII, pp. 605 - 611: Vening Meinesz' first measurement of gravity in the Netherlands confronted him with what appeared to be an insurmountable obstacle. At many stations it proved impossible to find stable support for the pendulums; the continuous vibration of the peaty subsoil would lead to unaccdeptable errors in the results. Vening Meinesz' efforts to overcome this difficulty were typical of the manner in which he confronted a problem. ..., he started with a thorough theoretical investigation embodied in his doctoral dissertation 'Bijdragen tot de theorie der slingerwaarnemingen (1915)...While working to solve the problems of unstable support, V.M. was tempted to direct his efforts more boldly to the apparently overambitious plan of measuring gravity at sea. In his 'Theory and practice of Pendulum Observations at sea', he again began with the first equations of motion for two pendulums affected by the same horizontal accelerations....A shipboard attempt proved a complet failure...The first voyage to measure gravity at sea, from the Netherlands to Java in 1923, ...a cruise from Holland to Egypt to test the new apparatus (1925) gave satisfactory results...While V.M. was on his 1937 cruise, B.C.Browne, a young geodesist at Cambridge sent him a letter that might be summarized as "Dear Sir, you have made a mistake". On studying Browne's arguments, V.M. had to admit that the numerous regular corrections failed to cover some of the disturbances due to the motions of the boat. He made this admission gracefully, without vexation or excuses. It is even possible that he enjoyed the opportunity to work again with the mechanics of the pendulum and to produce in corroboration three papers on "Browne terms" and the second volume of 'Theory and Practice'... For over thirty years his apparatus (of which some 5 copies are in existence) provided the only means for measuring gravity at sea,...': Very good copy.

Keywords: physics Zeewezen gravitation navigation Toon geodesy geophysics

**Price: EUR 520.00 = appr. US$ 565.16 Seller: Antiquariaat B.M.Israel B.V.**

- Book number: 4959

Description: Delft, Technische Boekhandel en drukkerij Waltman Jr., 1929. - 1941. 4to. In 2 vols. W. 9 plus 6 pls. Some diagrs. in the text. Original green publ. cloth. (Vol. I, upper cover some discol.). (VII, 95, I (Blank) pp.). (Laid in a letterpress compliment card 'Aangeboden door de Rijkscommissie voor Graadmeting en Waterpassing' / 'Envoi de la commission Géodésique Néerlandaise'). Complete set of 2 vols. DSB vol. XIII, pp. 605 - 611: Vening Meinesz' first measurement of gravity in the Netherlands confronted him with what appeared to be an insurmountable obstacle. At many stations it proved impossible to find stable support for the pendulums; the continuous vibration of the peaty subsoil would lead to unaccdeptable errors in the results. Vening Meinesz' efforts to overcome this difficulty were typical of the manner in which he confronted a problem. ..., he started with a thorough theoretical investigation embodied in his doctoral dissertation 'Bijdragen tot de theorie der slingerwaarnemingen (1915)...While working to solve the problems of unstable support, V.M. was tempted to direct his efforts more boldly to the apparently overambitious plan of measuring gravity at sea. In his 'Theory and practice of Pendulum Observations at sea', he again began with the first equations of motion for two pendulums affected by the same horizontal accelerations....A shipboard attempt proved a complet failure...The first voyage to measure gravity at sea, from the Netherlands to Java in 1923, ...a cruise from Holland to Egypt to test the new apparatus (1925) gave satisfactory results...While V.M. was on his 1937 cruise, B.C.Browne, a young geodesist at Cambridge sent him a letter that might be summarized as "Dear Sir, you have made a mistake". On studying Browne's arguments, V.M. had to admit that the numerous regular corrections failed to cover some of the disturbances due to the motions of the boat. He made this admission gracefully, without vexation or excuses. It is even possible that he enjoyed the opportunity to work again with the mechanics of the pendulum and to produce in corroboration three papers on "Browne terms" and the second volume of 'Theory and Practice'... For over thirty years his apparatus (of which some 5 copies are in existence) provided the only means for measuring gravity at sea,...': Very good copy.

Keywords: physics Zeewezen gravitation navigation Toon geodesy geophysics

- Book number: 4959