Scientific American Supplement, No. 392
Scientific American Supplement, No. 392
July 7, 1883
Book Excerpt
we have a longitudinal neutrality produced in the same
rod when placed magnetic west, the polarity in the latter case being
transversal.
In all these cases we have a perfectly symmetrical arrangement, and I have not yet found a single case in well-annealed soft iron in which I could detect a heterogeneous arrangement, as supposed by Ampere, De la Rive, Weber, Wiedermann, and Maxwell.
We can only study neutrality with perfectly soft Swedish iron. Hard iron and steel retain previous magnetizations, and an apparent external neutrality would in most cases be the superposition of one magnetism upon another of equal external force in the opposite direction, as shown at B, Fig. 1. Perfectly soft iron we can easily free, by vibrations, from the slightest trace of previous magnetism, and study the neutrality produced under varying conditions.
[Illustration: FIG. 1.]
If we take a flat bar of soft iron, of 30 or more centimeters in length, and hold it vertically (giving while thus held a few torsions, vibra
FREE EBOOKS AND DEALS
(view all)Popular books in Periodical, Science
Readers reviews
0.0
LoginSign up
Be the first to review this book