This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ... short paths as possible. This separation is due to the fact that air is a poor conductor for lines of force, or its permeance is low; hence they spread about in order to go through as large a mass of air as possible. Another characteristic is that in iron and in one or two other metals this diverging tendency is much ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ... short paths as possible. This separation is due to the fact that air is a poor conductor for lines of force, or its permeance is low; hence they spread about in order to go through as large a mass of air as possible. Another characteristic is that in iron and in one or two other metals this diverging tendency is much Fig. 15.--Experiment Showing Fig. 16.--Diagram Op Lines Lines Of Force Surrounding An Of Force Surrounding An Active Conductor. Active Conductor. less marked; and if a piece of such substance be placed in the path of lines of force, a portion of them will crowd together into it, leaving their normal paths through the air for the better medium, iron, nickel, or cobalt. This is because the metals in question have high permeance for lines of force. Lines of force must go from somewhere to somewhere. In the case of a magnet they go in a general sense from pole to pole, as shown in the cut. They are assumed, in the case of a magnet, to also go through the metal itself. They do not in this case Fig. 17.--Use Of A Compass In Tracing: Lines Of Force. all emerge from the poles. A multitude of lines start from all parts of the magnet and enter at corresponding points on the other side of its centre or neutral point. They may be traced by a small compass whose needle tends always to lie parallel with a line of force. Every line, therefore, can be traced through a circuit. The magnet with its lines of force represents what is known as a magnetic circuit. As magnetic polarization cannot be imparted to iron without creation of both north and south poles, and as a line of force starting from a north pole must return to a south pole, no magnetic lines of force can be established without the formation of a magnetic circuit. Here a difference from electrostatic...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.