Science Abstracts Volume 19

Science Abstracts Volume 19

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: of the hard wire is decreased, but not so much as in the case of the soft wire. With frequency 25 the damping was decreased nearly 9 % as compared with nearly 16 % for the soft wire. On increasing the frequency of the field 8 times the damping of the oscillations decreases 6 % for the hard wire and 28 % for the soft wire. A No. 16 iron wire of rigidity 780 x 10' gm.lcm.' was put through thesame series of tests as the nickel wires. The damping of the oscillations was slightly increased by the application of a direct transverse magnetic field of 900 units, and an alternating field produced a decrease of amplitude of about the same amount as in the case of the soft Ni-wire. With iron wire tested at different frequencies of field the behaviour is different from that of nickel: the damping of the torsional oscillations is slightly increased as the frequency is increased. The application of transverse magnetic fields, direct and alternating, to a comparatively short iron wire has a marked effect. The 70th oscillation is decreased by about 86 % by a direct field of strength 800 units. On applying alternating fields of strength 250 units and of four different frequencies to the short iron wire it was found that increase of frequency caused increase of damping of the torsional oscillations. The amplitude of the 70th oscillation is decreased by nearly 18 % when the frequency of the field is increased 8 times, and the amplitude is decreased nearly 30 % in a field of strength 260 and of frequency 200 per sec... S. 820. Magnetic Particles and Rotating Particles. A. Korn. (Phys. Zeits. 17. pp. 112-114, April 1, 1916.)----The old assumption that magnetic particles possess a mechanical rotation about the magnetic axis has won more

Product details

  • Paperback | 336 pages
  • 189 x 246 x 18mm | 599g
  • United States
  • English
  • black & white illustrations
  • 1236807448
  • 9781236807441