Popular Astronomy Volume 21

Popular Astronomy Volume 21

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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. 1913 edition. Excerpt: ...look on Professor See's arguments, which lead up to this, than more than expressions of his opinions on a difficult subject; my own opinion is that the 9th magnitude stars of the Milky Way are strictly comparable in luminosity with the sun. "There is another point. Could a star exist so large that it is millions of times the mass of the sun? We cannot certainly answer Yes I My own opinion is No! If matter were entirely free from molecular energy, quantities could undoubtedly be added to quantities indefinitely, but matter contains enormous stores of energy and it must at present remain an open question if masses of such matter can be added to indefinitely. A limit may possibly be reached when dissociation on such a violent scale would occur that bodies of the lighter elements would be expelled from the larger mass and double and multiple star systems formed, or the explosion might be of such a uniform type that the resulting effect would be a globular cluster of stars." R. T. A. Innes. Johannesburg, 1913 January 20. The Internal Heat of the Earth as a Source of Energy.--It is a matter of common knowledge that in sinking mining shafts there is a rise in temperature of about one degree Fahrenheit for every 69 feet, down to a certain depth. Active volcanoes afford still more striking evidence of the earth's internal heat. Have we not here an inexhaustible source of energy? We have, but it is difficult, if not impossible, to utilize it. If the prime requisite in making use of any source of heat is to obtain good conditions of thermal interchange with it, an insuperable obstacle would be found in the poor conducting qualities of rock. Only by fluid con-vection would it be remotely possible to obtain communication with the earth's...show more

Product details

  • Paperback
  • 189 x 246 x 13mm | 435g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236744802
  • 9781236744807