The causes of heat and cold : in the several climates and situations of this globe, so far as they depend upon the rays of the sun, considered in order to shew that the difference of heat and cold in other countries may be nearly ascertained by a thermometer as it was read to the Royal Society / by T. Sheldrake.

  • Sheldrake, Timothy, -1770.
Date:
1756
Catalogue details

Licence: Public Domain Mark

Credit: The causes of heat and cold : in the several climates and situations of this globe, so far as they depend upon the rays of the sun, considered in order to shew that the difference of heat and cold in other countries may be nearly ascertained by a thermometer as it was read to the Royal Society / by T. Sheldrake. Source: Wellcome Collection.

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    ( 4° ) B. B. B. B. Thefe Lines reprefent the Rays of the Sun falling Perpendicularly upon the Earth; from a due Obfervation of which it will appear that the Surface of the Globe at a very few Degrees diftance from the middle Rays which fall on the Tropic, reflects the Rays not Per¬ pendicularly but Obliquely, and thereby abate the force of Re-a£tion till that Power, which fo much increafes Heat, continually leflens till entirely loft; and the Rays of Light pafs by the Globe, without affording any Warmth. C. C. The Point of this Angle thews nearly the Place upon the Globe on which London is fituated, with the Angle of Reflexion, and alfo how much farther five Degrees of Rays diverge here than under Capricorn. In this Pofidon of the Globe by this Angle of Reflexion, it appears, that as the Ravs are reflected back in Lines more and more Oblique, Motion or Adlion, being thereby leffened, Heat muft for the fame Reafon