Geophysics III/Geophysik III - Part III/Teil III (English, French, German, Paperback, Softcover reprint of the original 1st ed. 1971)

Sect. 14. 297 for such slow variations the effect described under 2. above will be by far the most predominant. In fact, the equipment provides a record of the time derivative of the element in question. 6) Records of the time derivatives of magnetic elements can, however, be obtained in a more direct way by recording directly the electromotive force (e. m. f. ) induced in suitably disposed coils by the variations of the geomagnetic field 10, 11. When a coil with the total winding area F is placed with its axis in the direction of a geomagnetic force component the variation of magnetic induction B with time will produce an electromotive force 1 dB 1 dH e=- coveu,uuFdT=- 'oV~,uQf1oFdT (i). )) . !. . =_to-13~ d(B/y) (1). )a) v em! d(tjs) in the coil. The e. mJ. may be amplified and recorded by means of an oscillograph or on a tape recorder. but more often the coil is used in connection with an ordinary galvanometer and the scale value of, for instance the dl1/dt record, will then - in the same way as the scale value of the magnet variometer treated in Subsect. IX - be dependent on the damping factor IX and on TO/T, where To and T are the oscillation periods for the undamped galvanometer and for the magnetic pulsation respectively. The amplitude recorded will be proportional to the amplification factor I, obtained from Eq. (1).

General

Imprint:	Springer-Verlag
Country of origin:	Germany
Series:	Handbuch Der Physik Encyclopedia of Physics/Geophysik/Geophysics, 10 / 49 / 3
Release date:	2012
First published:	1971
Editors:	Karl Rawer
Dimensions:	244 x 170 x 29mm (L x W x T)
Format:	Paperback - Trade
Pages:	558
Edition:	Softcover reprint of the original 1st ed. 1971
ISBN-13:	978-3-642-80641-4
Languages:	English • French • German
Categories:	Books > Science & Mathematics > Physics > Applied physics & special topics > Geophysics
LSN:	3-642-80641-4
Barcode:	9783642806414

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