Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 443
en explained, that electric cur-rents tend always to assume. Fig. 369 represents an artificialglobe, surrounded by a coil of in-sulated wire, surmounted by %magnetic needle. The needle willalways point to the north pole ofthe globe, on transmitting the bat-tery current. The dip of the needle may… … ELECTRO-MAGNETISM. 439 Tig. 370. gions it dips vertically doWTi in order that its currents may be parallel with,those of the earth; for in those regions the sun performs his daUy motion incircles parallel to the horizon. At the equator, the course of the sun ianearly at right angles to the horizon,…
Physics · Science · Technology
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