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XII.—Results of the Makerstoun Observations, No. I. On the relation of the Variations of the Horizontal Intensity of the Earth's Magnetism to the Solar and Lunar Periods

Published online by Cambridge University Press:  17 January 2013

J. A. Broun Esq.
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Extract

The following communication is intended to be the first of a series, in which I propose to consider the results of observations made at Makerstoun, near Kelso, Roxburghshire, in the Observatory of the President of this Society. These observations, and the tabular results, will be found ultimately in the volumes of Makerstoun Observations, constituting volumes of the Society's Transactions.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 16 , Issue 2 , 1846 , pp. 99 - 109
Copyright
Copyright © Royal Society of Edinburgh 1846

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References

page 100 note * November, December, and January, have been taken as the three winter months.

page 103 note * The line should have been drawn through January 1844 and January 1845, but that there is an irregularity in the progress of the horizontal force from December 1844 to January 1845, compared with the previous years. I have, however, also reduced the means to the line passing through January 1844 and January 1845, and find the ordinate of the morning node slightly increased, but that for the evening node diminished.

page 107 note * Quoted by M. Francoeur; Uranographie, p. 97.

page 108 note * It is evident that the variations of horizontal intensity may be due either to changes of the total intensity, or of its direction; any reasoning, therefore, on these facts must be necessarily incomplete, until we are certain of the actual effect.

page 108 note † I have, since this was written, been favoured by Professor Forbes with a copy of M. Kreill's table for the horizontal force during the moon's hour angle. It indicates a minimum of intensity about two hours before the meridian passage, and maximum peaks at 12h and 15h, giving the interpolated period of maximum about 1½ hours after the inferior meridian passage; the latter period agrees completely with my own conclusion, the former differs about three hours from my result.