Instructions in the Use of Meteorological Instruments

Instructions in the Use of Meteorological Instruments

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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. 1892 edition. Excerpt: ...freely exposed to sun and air by fixing it horizontally at the same height above the ground as that at which the shade thermometers are placed. This is usually 4 feet. It must be at a distance from walls or trees or any objects which may obstruct or reflect the full rays of the sun. The bulb is usually directed to the S.E. If, however, the thermometer be a maximum thermometer on Negrettis principle (p. 40) it may with advantage be placed in a vertical position, with the bulb uppermost. The reading of such an instrument depends on the elevation of the temperature at which equilibrium is established between the heat produced by the direct rays of the sun and the cooling produced by the radiation of heat from the bulb to the external jacket. The jacket has a temperature depending upon, and differing but slightly from, that of the air surrounding the in The object of coating part of the stem ii to prevent the temperature of the blackened bulb being lowered by contact with the cooler glass of the unblackened stem.., Solar Radiation. strument. It follows, then, that the excess of this temperature of equilibrium over that of the outer jacket is an exact measure, and its excess over that of the outer air is a closely approximate measure, of the power which the suns rays, acting through glass, have exerted upon the bulb; hence, the following instructions: --Observe the maximum temperature registered by the solar Rules for obradiation thermometer, subtract from this the maximum tempera-servingture of the air in the shade, and the result indicates approximately the greatest amount of radiation which has occurred during the day... It has also been suggested to expose alongside of the black bulb in vacuo a similar thermometer, also in vacuo, but with..show more

Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236885023
  • 9781236885029