Scientific American Supplement, No. 392

July 7, 1883

Author: Various Authors
Published: 1883
Language: English
Wordcount: 40,305 / 126 pg
Flesch-Kincaid Reading Ease: 35.4
LoC Category: Q
Downloads: 491
mnybks.net#: 360
Origin: gutenberg.org
Genres: Periodical, Science
Advertisement
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

Cover image for

Download


show mobile phone QR code

Donate a small amount via Paypal below or read about some other ways that you can support ManyBooks.