The Edinburgh Encyclopaedia Volume 18

The Edinburgh Encyclopaedia Volume 18

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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. 1832 edition. Excerpt: ...was suspended on small iron wire, in a recess facing the north-west, and defended from the local infiuences of the dwelling-house, or the radiated heat of the sun. This instrument, in perhaps ninety days in an hundred, was examined in the morning as soon as the light was sufficient, and the degree indicated piut on record. At, or after mid-day, the highest degree was recorded; and finally at nine or ten at night. These three observations entered in a tabular manner enabled the observer to enter a mean. The state of the weather was each day carefully recorded. The observer, the writer of this article, from the 6th day of November 1828 to the moment of writing, January 1832, with the exception of about fifteen days, made every entry from his own observations. The prevailing wind was also carefully observed and recorded. _ Four very fine perennial fountains were chosen, and their temperature taken at intervals of 30 days nearly. On this latter mode of ascertaining mean temperature we have to observe, that if done with adequate attention, and once or twice monthly during one or more, years, a very satisfactory mean may be produced. Observations of this kind, similar to all other experiments accurately made, have a tendency to remove popular error; as may be seen by reference to article l./IETEOROLOGY, Vol. XIIL, page 173, 174 of this Encyclopaedia. The observations there made on the great changes of temperature in the water of wells and fountains accord with the results obtained in the same manner at Sandy Spring. TABLE XXXV..M6d7l illonthly temperature of water at the head of perennial fountains in the vicinity of Sandy Spring One primary object in inserting this table, is to call the attention of observers to this elegant and easy mode of...
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Product details

  • Paperback | 544 pages
  • 189 x 246 x 28mm | 962g
  • United States
  • English
  • black & white illustrations
  • 1236776380
  • 9781236776389