A Treatise On Electricity in Theory And Practice volume 3
A Treatise On Electricity in Theory And Practice volume 3
Auguste Arthur De La Rive
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Lamont had found that the variation CHAP. In. TERKESTRIAL MAGNETISM. 251 of this element, just like that of declination, has diminished since the period mentioned. Independently of the regular variations, the magnetic ele- ments are subject to irregular variations or disturbances, which are in general simultaneous in several different places, and themselves appear subject to certain general laws. In order to study these irregular movements, it is necessary to deduct from each observation the me...an monthly value of the declination which corresponds to the same hour; what re- mains is the deviation of the needle from its regular march. M. Lamont has drawn out Tables, which present these devia- tions for more than 20, 000 observations. The inspection of these shows that the irregular movements of the needle have a regular diurnal period ; we see in these that the hours of maximum and minimum of these periods coincide with the hours of the secondary maxima and minima of our Table of Diurnal Variations, inserted above.
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