File:The Bakerian Lecture- A Magnetic Survey of the British Isles for the Epoch January 1, 1886 (1890) (14595846470).jpg

Identifier: philtrans08603087 (find matches)
Title: The Bakerian Lecture: A Magnetic Survey of the British Isles for the Epoch January 1, 1886
Year: 1890 (1890s)
Authors: Rucker, A. Thorpe, T.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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. On turning to the disturbances (Plates IX. and X), we find that both theDeclination and the Horizontal Force give nearly coincident ridge lines runningalong the line just indicated. The declination line passes northward to the Cumber-land Lakes and southward to the Wash. The Horizonal Force line turns south amidthe Yorkshire Hills and runs toward North Wales. SURVEY OF THE BRITISH ISLES FOR THE EPOCH JANUARY 1, 1886. 307 As we should expect from the close agreement of the Declination and HorizontalForce ridge lines the disturbing forces in this district are very easy to interpret. Inno place in the kingdom is a locus of attraction more clearly indicated. At Appleby,Thirsk, Hull, and Mablethorpe the disturbing forces act in a south or south-easterlydirection; at Giggleswick, Leeds, Gainsborough, and Lincoln they point north-east. A well-marked ridge line thus runs from the Lincolnshire Wolds through Yorkshireand the limestone district of Westmoreland to the Cumberland Lakes. Fig. 29.
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North-Eastern England. In the southern part of its course it traverses a region of high Vertical Force, andpasses near the station at which the positive disturbance is a maximum, terminatingin the Wash peak. The observations at Manchester and Chesterfield appear to indicate another centreof attraction in the limestone district of Derbyshire, but two stations are hardlysufficient to decide such a point. It is, however, very significant that the limestonesof Derbyshire are intercalated with the basaltic rocks known locally as toadstones,and although these do not cover a great area at the surface it is by no means 2 R 2 308 MB. A, W. RtTCKER AND DR. T. E. THORPE ON A MAGNETIC improbable, as Professor Judd informs us, that large masses of similar rocks occur at no great depth. Fig. 30.

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