Science Abstracts; Physics Abstracts Volume 13

Science Abstracts; Physics Abstracts Volume 13

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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. 1910 edition. Excerpt: ... capacity of copper is about 45 times that of carbon and 14 times that of graphite. Current densities.--The cross-sections in-all the test-bars being the same, the above also represent the relative values of the current densities. Walts.---The curves for all four materials are seen to be nearly diagonal lines, indicating that the watts increase nearly in proportion to the, temperature. Electrical 'resistivity.---The four materials show great differences in this property; at 1400 C. the relative values are about: Copper, 1;.iron, .10; graphite, 72; carbon, 840. Thermal conductivity.-The heat conductivities difier far less than the electrical resistivities. The relative values at 14(D C. are about: copper, 1; graphite, 0'34; iron, 0'22; carbon, 0'17.-Electrode vaItage.---Iron is nearly as good as copper and much better than graphite although the difierence seems to grow less at high temperatures.. The relative values at 1400 C. are about: copper, 1; iron, 1'5; graphite, 5; carbon, 7'6. Specific section.--At 1400-C. the relative values are about: copper, 1;, iron, 6'6; graphite, 14'6;'carbon, 45. Actual losses and sizes.--4-The losses at temperature of 1400 are in the same ratio as the electrode voltage given above, and the sizes are in the same ratio as the specific sections.-, _ _-.__-__. C.O.B. 1024. Preparation of Aluminium in the Laboratory. B. Neumann and H. Olsen. (Zeitschr. Elektrochem. 16. pp. 280-236, April 1, 1910.)---After remarks on technical Al furnaces the authors describe laboratory apparatus of similar types, wrought-iron boxes provided with a bottom plate of Acheson graphite and an upper suspended electrode. The best yield of 704 per cent. was realised with a current density of 2 amps./cm.'; this figure...show more

Product details

  • Paperback | 390 pages
  • 189 x 246 x 20mm | 694g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236832051
  • 9781236832054