An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 159
neto graphs, which givea permanent record of the slight changes in the terrestrialmagnetic field. It is of such great importance to determine the exactdirection of the earths magnetic lines of force or magneticmeridians, not only on land but particularly on the oceans,that the Carnegie Institute… … William Thomson, Lord Kelvin (1824-1907). A British physicist and electrical engineer ; horn in Belfast, Ireland ; for morethan fifty years professor of physics in Glasgow University, Scotland; in-vented the mirror galvanometer used in cable signaling; developed an im-proved form of mariners…
Electricity · Magnetism
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