Professional Papers of the Signal Service Volume 1-18

Professional Papers of the Signal Service Volume 1-18

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 edition. Excerpt: ...of the earth's rotation, is expressed by 2.yi?.-cos 6 g; in which v is the lineal velocity of the body relatively to the earth's surface, n that of the earth's rotation at the equator, 0 the angle of the polar distance, and g the force of gravity. If the velocity is expressed in miles per hour, the expres V COS 0 sion in round numbers becomes.!r.9 that is fr each mile of velocity per hour, the force is jsitoos f gravity, multiplied into the cosine of the polar distance. Hence a railroad car on the parallel of 45 north, running in any direction at the rate of forty miles per hour, presses to the right with a lore equal to about joo Par 'ts weight. The effect of this deflect ing force upon what Mr. Stevenson calls the barometric gradient is easily estimated. Since the strata of equal pressure of the atmosphere, so far as this force is concerned, must be perpendicular to the resultant of this force and gravity, the sine of inclination of any such stratum to the earth's surface must be-1' cos--, and the change in barometric pressure for any given 100,000 distance is equal to the weight of a column of atmosphere of a height equal to the change of level of the stratum of equal pressure, and of a density equal to that at the earth's surface. The barometric gradient, then, as expressed by Mr. Stevenson, for any distance d expressed in miles is ',"s 0 x 30 inches; putting Ave miles for the height of a homogeneous atmosphere, and thirty 51X50,000 inches for the pressure at the earth's surface. Round numbers are used throughout, since it is only the order of the effects we wish to determine, and not their exact amounts. According to all observations, there is a steady and very strong wind blowing all around the earth in the middle and higher latitudes...
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Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123659049X
  • 9781236590497