File:The Bakerian Lecture- A Magnetic Survey of the British Isles for the Epoch January 1, 1886 (1890) (14759558376).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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i.e., inwhich the force is great) to the east and west respectively. At Cumbrae the VerticalForce is a maximum, and the existence of a region of high Vertical Force in thisneighbourhood is remarkably confirmed by the fact that Welshs observations give apositive disturbance at Ardrossan a few miles further south, though at the neighbour-ing stations both to the south and north it is negative (fig. 23). On the whole then SURVEY OF THE BRITISH ISLES FOR THE EPOCH -JANUARY 1, -1886. 303 there can be no doubt that in this district the ridge line passes through the region ofgreatest Vertical Force disturbance. It obviously does so in the east. In the west theregion of positive disturbance is defined by a single station only, and its boundaries areuncertain. If we included Welshs observations at Ardrossan they would be pushedfurther south. In the central region there are clear indications of a maximum dis-turbance, though the largest values are negative. Thus at Row and Stirling the Fig. 26.
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Scotch. Coal-field District. Vertical Force disturbances are — 0188 and — *0092 ; at Glasgow and Carstairs— 0080 and -~*0079 ; and at Ayr and Hawick — *0145 and —0099. The two centralstations which are nearest to the ridge line have algebraically the largest values. The convergence of the Horizontal disturbing Forces towards the ridge line isunmistakeable. The isogonals (Plate V.) give evidence of a subsidiary centre ofattraction near Lochgoilhead. 304 MR. A. W. RUCKER AND DR. T E. THORPE ON A MAGNETIC North- Western England, North Wales, and Galloivay. The stations in this group are bounded on the west by the northern part of theIrish Sea. They are few in number, and so large a portion of the intervening spacesis covered with water that we cannot hope to unravel the intricacies of the district. Fig, 27.

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