The Atmosphere

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On August 29, 1865, the balloon left the Crystal Palace at 4 hrs. 6 min. P. M. , and descend- ed at Wey bridge at 5 hrs. 30 min. P. M. , a point thirteen miles from the place of ascent. Dur- ing this time fifteen miles was registered by Robinson's anemometer at the Royal Observatory, Greenwich. ED. ] 316 THE ATMOSPHERE.
cases this is exceeded. Leaving out of the question the effects of strong cyclones in the tropics, several cases have occurred in the tem- perate zones where the pressure exerci
...sed by the wind in a very limited space was much above the calculations of meteorologists. To cite only one instance, the tempest which occurred on the 27th February, 1860, and which blew from the west in the plains of Narbonne, was so violent as to blow trains off the rails on the line between Salces and Eivesaltes. The pressure must have been at least eighty pounds to the square foot.
It has been calculated that, approximately, the mechanical force of the wind js in proportion to the surface of the object exposed to it, and in direct ratio to the square of the velocity, and that for a velocity of a yard per second, for each square yard, the effect produced is about a quarter of a pound.


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