Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
which traverses the ring in tlie same directionthe lamp has taken. In this manner the sun continually heats successive portions of theearth, causing currents of electricity to flow around the globe from eastto west, in a direction at right angles to the line joining the magneticpoles. A magnetic… … The figure represents a small artificial globe, surrounded by a coilof insulated wire, surmounted by a magnetic needle. When the cur-rent of the battery is transmitted through the wire, the needle pointsto the north pole of the globe. TJie dip of the needle is accounted for in the same manner. At…
Physics · Astronomy
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