IV. Contributions to terrestrial magnetism.— No. XIV

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Abstract
In this paper ( i. e . the XlV. th Number of the “Contributions to Terrestrial Magnetism”) I have the pleasure of presenting to the Royal Society the second half of the Magnetic Survey of the Northern Hemisphere, of which the first half was presented by me last year and is printed as No. XIII. of my “Contributions to Terrestrial Magnetism.” These two papers, taken together with No. XI. (appertaining to the Southern Hemisphere), embrace fully three quarters of the entire globe. The form in which the observations are collected in the two latest papers (No. XIII. and the present, No. XIV.) is the same, viz. arranged in zones of latitude, each zone beginning with the meridian of Greenwich, and passing eastward round the globe until the same meridian is again reached. In No. XIII. these zones were eight in number, being each 5° of latitude in breadth (excepting the last, which comprised also the few observations north of the 80th parallel). In the present paper the zones are four in number, each being 10° in breadth.

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