The Bakerian Lecture: A Magnetic Survey of the British Isles for the Epoch January 1, 1886 . Easter Stations {gX^tXs; x*r 4. cu x* / Mathon .Western Stations < ^ -, n ^ [ Uolwall Green . Declination. 19 33-0 19 22-4 18 46-5 19 36 Force. 1-76871-76821-7655T7627 From these the disturbing forces were deduced, the notation being the same as thatused on p. 268. -â â Great Malvern ....Malvern Wells .... Mathon . Col wall Green F. â â â â â-.â.â«âââ â .â â â â â â *% 0. â¢0121â¢0081â¢0147â¢0119 126-6 148-7- 97-8-140-4 The accompanying Map shows the direction of these forces and their relativemagn
The Bakerian Lecture: A Magnetic Survey of the British Isles for the Epoch January 1, 1886 . Easter Stations {gX^tXs; x*r 4. cu x* / Mathon .Western Stations < ^ -, n ^ [ Uolwall Green . Declination. 19 33-0 19 22-4 18 46-5 19 36 Force. 1-76871-76821-7655T7627 From these the disturbing forces were deduced, the notation being the same as thatused on p. 268. -â â Great Malvern ....Malvern Wells .... Mathon . Col wall Green F. â â â â â-.â.â«âââ â .â â â â â â *% 0. â¢0121â¢0081â¢0147â¢0119 126-6 148-7- 97-8-140-4 The accompanying Map shows the direction of these forces and their relativemagnitudes. The Worcestershire Beacon (1440 ft.) is the highest point on the range ;to the south of this the height diminishes, and then increases again to the Hereford-shire Beacon. The directions of the disturbing forces tend towards these hills, andthe results are, we think, only compatible with the view that the Malverns attract thenorth-seeking pole of the magnet. 2 N 2 276 MR, A. W. RttCKER AND DR. T. E. THORPE ON A MAGNETIC Fig. 12. PB liwnmnWMKaiwftt. Disturbing Forces near the Malvei^n Hills. The Island of Canna. The attraction exerted by the Malverns having been demonstrated, it is convenientto discuss in the next place a locality where the disturbances are enormously greater. Popular tradition has long attributed to the basaltic rocks of the Island of Cannathe power of deviating the needle through very large angles. The compasses ofpassing ships are supposed to be affected by the eastern extremity of the island, onwhich stands Compass Hill. Magnetic observations were made on the Island by Sir Frederick Evans (g 1872, vol 162, p. 325), but, we have, we believe, been able to add con-siderably to what was already known of its magnetic properties. The island, which is about fifteen miles south-west of Skye, is about five miles long,its greatest length lying nearly due east and west. It is divided into two approxi-mately equal portion
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectproceed, bookyear1890
