Report of the Meetings Volume 14

Report of the Meetings Volume 14

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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. 1845 edition. Excerpt: the number of the clearly recorded observations are competent to furnish. As this machine does not register integral results, but merely the pressure of the wind on a given area, it is requisite to find the mean velocities due to the several mean pressures, and multiply these into the time during which each wind blew. The recorded observations being entered under prepared forms containing the directions of the wind to sixteen points ofthe compass for every twentyfour hours, together with the corresponding pressures at each hour; a mean force was obtained from several heights of the pencil on each side of the hour-line, not exceeding half an hour on either side, and the mean force thus determined was taken as the mean force of that hour. From these forces the mean pressure and total number of hours which each of the several winds blew were deduced. In order to turn these mean pressures into corresponding velocities, extensive tables of pressure and velocity were calculated from the labours of Rous, Smeaton, Hutton and others, as well as by reference to experiment, and from these the velocity of the wind in feet per second, or miles per hour, to any given pressure, could be readily found. The registers however of Osler's anemometer which have come into my hands, inclusive of some lately received, are all very defective in continuous and perfect observation, and are beside occasionally interrupted by the damage done to the machinery of the pressure-plate during very violent gales. It became requisite therefore to resort to some approximate method of discussing such observations as the registers contain, so as to make them available for scientific deduction. The general method pursued in this case is as follows. First. The forces more

Product details

  • Paperback | 350 pages
  • 189 x 246 x 19mm | 626g
  • United States
  • English
  • black & white illustrations
  • 1236786394
  • 9781236786395