Bulletin of the Southern California Academy of Sciences Volume 6-7

Bulletin of the Southern California Academy of Sciences Volume 6-7

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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. 1907 edition. Excerpt: ...full pound--and its substance solid platinum, one of the most refractory of metals, it would have been melted by only 49 units of heat--provided the temperature was as high as 3230 degrees Fahrenheit. Experiment shows that when a body speeds through air 125 feet per second its temperature rises 1 degree. If its velocity is doubled, its temperature rises 4 degrees; if trebled, 9 degrees. That is, the number of degrees rise of temperature is the square of the times the velocity contains 125 feet. Allowing that our shooting star was one of the slowest, its velocity only 8 miles per second, its temperature was raised 5280 1 11419 degrees; more than three times the temperature at which even platinum melts. It seems therefore, that whatever the shooting star's substance it is quickly raised to glowing heat; that if solid it is soon melted and vaporized--the melted matter being swept off by the rush through the air, forming the luminous train until none is left, when comes its sudden extinction. Its cooled vapors and ashes mingle with the air, and the dust-like debris slowly settles to the earth's surface. Number Daily Simple means will serve to effect a fairly accurate count of the number of shooting stars visible at a given place during a definite period. At a selected station in an open space erect a pole 6 feet high. the pole, drive a stake. Connect these stakes by a stout string 31/2 feet above the ground, and from each stake, at that height, stretch a string to the top of the pole. Trace from it on the ground two lines diverging 45 degrees--half a right angle. On each line, at a distance of 6 feet from In Fig. 4, A is the station, Aa the pole. At distances and heights stated, the stakes Bb and Cc are connected by string be; and strings...show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236802209
  • 9781236802200