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4. Results of Makerstoun Observations, No. III. On the Solar and Lunar periods of the Magnetic Declination

Published online by Cambridge University Press:  16 March 2015

J. A. Broun Esq.
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Extract

The absolute westerly declination at Makerstoun, for the mean epoch, June 1844 = 25° 17′·12.

The annual motion of the north end of the needle towards the east = 5′·67.

The annual period of magnetic declination consists of a double oscillation, having nearly the following epochs of maxima and minima.

Type
Proceedings 1846-47
Information
Proceedings of the Royal Society of Edinburgh , Volume 2 , 1851 , pp. 144 - 145
Copyright
Copyright © Royal Society of Edinburgh 1850

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References

page 144 note * By maximum is always meant an extreme westerly position of the north end of the needle, and by minimum an extreme easterly (or rather northerly) position.