. Electricity simplified. The practice and theory of electricity ... /til. i,v\:—>vA.,\ \\s Fig. 14.—Diagram of Paths of Lines of Force of a Bar Magnet. The circular lines of force which surround a wirecarrying a current are shown by passing the wirethrough a horizontal card, upon which filings treatedas above arrange themselves in circles. The diagramFig. 18 shows the conception of the constitution ofsuch lines of force, with their surrounding whirls. Lines of force possess several peculiar characteris-tics. One is that in air and most other mediums theyare influenced by a tendency to sepa
. Electricity simplified. The practice and theory of electricity ... /til. i,v\:—>vA.,\ \\s Fig. 14.—Diagram of Paths of Lines of Force of a Bar Magnet. The circular lines of force which surround a wirecarrying a current are shown by passing the wirethrough a horizontal card, upon which filings treatedas above arrange themselves in circles. The diagramFig. 18 shows the conception of the constitution ofsuch lines of force, with their surrounding whirls. Lines of force possess several peculiar characteris-tics. One is that in air and most other mediums theyare influenced by a tendency to separate from eachother, but at the same time tend to take as shortpaths as possible. This separation is due to the fact 80 ELECTRICITY SIMPLIFIED. that air is a poor conductor for lines of force, or itspermeance is low; hence they spread about in orderto go through as large a mass of air as characteristic is that in iron and in one ortwo other metals this diverging tendency is much &JUUUJSLSL*Jzi. F^wL Fig. 15.—Experiment ShowingLines of Force Surrounding anActive Conductor. Fig. 16.—Diagram op Linesop Force Surrounding anActive Conductor. less marked; and if a piece of such substance beplaced in the path of lines of force, a portion ofthem will crowd together into it, leaving their normalpaths through the air for the better medium, iron,nickel, or cobalt. This is because the metals inquestion have high permeance for lines of force. THE MAGNETIC CIRCUIT. 81 Lines of force must go from somewhere to some-where. In the case of a magnet they go in a generalsense from pole to pole, as shown in the cut. Theyare assumed, in the case of a magnet, to also gothrough the metal itself. They do not in this case
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Keywords: ., bookcentury1800, bookdecade1890, bookidel, booksubjectelectricity
