File:The Bakerian Lecture- A Magnetic Survey of the British Isles for the Epoch January 1, 1886 (1890) (14779400651).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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which passes through Chesterfield, Nottingham,Melton Mowbray, and Peterborough. This view is supported by the fact that aridge line, on passage across which the disturbance of the Declination changes sign,runs from near Chesterfield to near Melton Mowbray. If this view were correct, Melton Mowbray would have to be regarded as near thesummit of an extremely steep peak, as the Vertical Force changed from 0*0305 to0*0080 in the small distance between the two stations. The direction of theHorizontal Forces would indicate a point a little to the west of both stations as theactual peak. MDCCCXC.—A. 2 V 290 MR. A. W. EtTCKER AND DR. T. E. THORPE ON A MAGNETIC Fig. 21 is an attempt to realise the magnetic constitution of this part of Englandfrom this point of view. In studying it we must remember that the direction of theHorizontal Force at a station where the Vertical Force is a maximum or minimum mustbe indeterminate in the sense that it cannot be deduced from the Vertical Forces Fig. 21.
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Contour lines of Vertical Disturbing Force and Horizontal Disturbing Forces in South-EasternEngland. Each darker tint corresponds to an increment of 0*0100 metric unit in the VerticalDisturbing Force. at neighbouring stations. All that we know when the Vertical Force is a maximumis, that a peak is probably in the neighbourhood, but on which side of the station wedo not know, unless, as in the case of the Reading disturbance, other stations indi-cate it. SURVEY OF THE BRITISH ISLES FOR THE EPOCH JANUARY 1, 1886. 291 The whole district may apparently be divided into four parts, of which theboundaries are indicated on the map by heavy lines. The southernmost is the region of the Reading disturbance. The tendency of theHorizontal Forces to act towards regions of high Vertical Force is unmistakeable. AtKings Sutton the direction of the resultant appears to be affected by the regionof high Vertical Force to the north, near Kenilworth. At Worthing and Ryde theHorizontal Forces point direct t

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