Proceedings of the American Association for the Advancement of Science Volume N . 11. American Association for Science
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Author: American Association for Science
Number of Pages: 144 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Type: PDF
ISBN: 9781235976827
File size: 39 Mb
File Name: Proceedings.of.the.American.Association.for.the.Advancement.of.Science.Volume.N...11.pdf
Download Link: Proceedings of the American Association for the Advancement of Science Volume N . 11
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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. 1858 Excerpt: ...by Lieutenant W. P. Trowbridge, of the U. S. Corps of Engineers, under whose supervision the observations were made. The directions of the winds were noted in points, and the force in.he conventional scale before referred to. These numbers were reduced to velocity in miles per hour, by the tables given in my former paper, and the quantity of wind blowing from any quarter during a given period was thence readily found. The tables and diagrams are thus of the same kind as those which I have before presented to the Association. They were made under the direction of Assistant L. F. Pourtales, of the U. S. Coast Survey, to whose care, assiduity, and knowledge I am indebted for the opportunity of presenting them. The computations and diagrams were made by Miss _Mary Thomas. I The observations were taken three times each day, at 6 A. M. and P. M., and at noon, except on Monday of each week, when hourly observations took the place of the regular daily ones. From these latter results the reference of the three daily observations to the mean of the day has been made. p The quantities of wind for each hour and for each direction were computed and grouped by months, and then plotted. The eye readily takes in the characteristics of the winds at different periods of the day and year, and for the various directions.. To apply these to the reduction of the daily observations, tables were formed of the average time during which each wind blowing would give from observations at the three hours already named the result for the day. For example, the west wind at San Francisco gave for the quantity in twenty-four hours by the daily observations, 505. The mean hourly quantity at 6 A. M. being six, at 12 M., twenty-seven, and at 6 P. M., thirty-one. These quantities respectively, ..
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