Philosophical Transactions of the Royal Society of London; Containing Papers of a Mathematical or Physical Character Volume 208

Philosophical Transactions of the Royal Society of London; Containing Papers of a Mathematical or Physical Character Volume 208

By (author) 

List price: US$13.03

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks

Description

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. 1908 edition. Excerpt: ...when the pressure was increased 106 times. The difference between the old results and the new ones is so large that it was considered worth while to repeat the old experiments. A new wire was put up and heated in air, and was found to give a small current. The air was then pumped out and small quantities of pure hydrogen were successively admitted. The current was measured at each pressure, keeping the temperature constant. The following table contains the results obtained. The last three pressures were obtained by pumping out the hydrogen. These results show that with a new wire the leak rises with the pressure and falls when it is reduced. The experiment was repeated immediately, and similar results were obtained. Next day, after the wire had been all night in hydrogen at a low pressure, the following results were obtained: --It appears, therefore, that with a new wire the results are very different from those obtained with an old wire. If a wire which has been heated in hydrogen at high pressures and is giving a large leak nearly independent of the pressure is heated in air, the leak falls at once to a small value. If the air is pumped out and a little hydrogen admitted, the leak at high temperatures is not affected at first, but after heating in the hydrogen for some time it usually develops rather quickly. The leak then rises when the pressure is increased, and has about the same value as with a new wire. On pumping out the hydrogen the leak only falls very slowly with the time. The following table gives the currents at several pressures with a wire treated in the way just described. This wire, after heating in air, was heated to 1490 C. in hydrogen at 0"005 millim. pressure. The leak remained unchanged for two hours and then...show more

Product details

  • Paperback | 168 pages
  • 189 x 246 x 9mm | 313g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236982312
  • 9781236982315