Horizontal Component of Magnetic Force for 1846

1850 ◽  
Vol 19 (2) ◽  
pp. 32-34
Keyword(s):  
Magnetic Force ◽  
Horizontal Component

XXIV.—On the Lunar Diurnal Variation of Magnetic Declination at Trevandrum, near the Magnetic Equator, deduced from Observations made in the Observatory of His Highness the Maharajah of Travancore, G.C.S.I.

1872 ◽  
Vol 26 (4) ◽  
pp. 735-757
Author(s):  
J. A. Broun
Keyword(s):  
Diurnal Variation ◽  
Magnetic Force ◽  
Horizontal Component ◽  
Magnetic Equator ◽  
Horizontal Force ◽  
Magnetic Declination ◽  
Magnetic Needle ◽  
Made In

1. The lunar diurnal variation of magnetic declination as first discovered by Kreil, depended on too few observations to be free from the errors introduced by irregular disturbing causes. The independent discovery of the lunar action on the magnetic needle made afterwards by myself, was liable to the same criticism; but the agreement of the results obtained, both for the magnetic declination and the horizontal force, was sufficiently great to give a considerable value to the conclusion, that the magnetic needle obeys a diurnal law, depending on the moon's hour angle, both as to its direction and the force with which it is directed. This conclusion was farther confirmed in the discussion first made by myself, for the lunar diurnal variation of the vertical magnetic force, which gave, within an hour, the same epochs of maxima and minima as those obtained previously by me for the horizontal component.

scholarly journals A portable variometer for magnetic surveying

1916 ◽  
Vol 92 (639) ◽  
pp. 313-321
Keyword(s):  
Magnetic Force ◽  
Horizontal Component ◽  
Terrestrial Magnetism ◽  
Magnetic Forces ◽  
Gauss Method ◽  
Electrical Methods ◽  
First Time ◽  
Fundamental Physical

The method of measuring the horizontal component of the earth's magnetic force in absolute units devised by C. F. Gauss (Collected Works') will probably always be regarded as one of the most important contributions to the science of terrestrial magnetism. By its introduction magnetic forces were for the first time expressed in terms of the fundamental physical units. The principles of Gauss' method have continued in general use from 1836 up to the present time; but it seems likely that before long it will be superseded by simpler electrical methods.

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