Publisher's Synopsis
Excerpt from The Clouds and Fogs of San Francisco
In such a book as the one issued this year, 1911, by Professors Rotch and Palmer, aviators and aeronauts can find for their guidance, the prevail ing conditions at various levels. For example, the wind velocity increases with height and the increase is greater in winter than in summer; but during the late spring and early autumn the increase between 500 meters (1640 feet) and 1500 meters (4921 feet) is very gradual. Again, the sea breeze is found to be a shal low stream while winds from the same direction, but of cyclonic origin, are of considerable depth. Winter winds are stronger than summer winds at nearly all levels, and westerly winds stronger than easterly winds.
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