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.

    17/52 (page 9)
    4 ( 9 ) Light, compared with that of the Sun; but no Heat is to be raifed from any Colledion of its Rays. For the fame Reafon that the Moon reflects no Heat, the Tops of Mountains in hot Countries are feldom free from Snow, becaufe the Whitenefs of the Snow reflects the Heat back again in fuch a Divergency as to prevent any Heat from being generated. And there¬ fore the Plants that grow upon Mountains in hot Countries, will alfo grow upon Plains in colder Countries this is evident from the Ce¬ dars which flourifh in the Botanic Garden at Chelfea. But as the greatefl Dimenfion of Mountains is towards their Bafe they gradually acquire Warmth, till it becomes nearly uni¬ form with the Plain on which they ftand. Heat is always increafed or diminifhed, as the Colour of the Body, on which the Rays of the Sun fall, is light or dark, or admits of different Shades from white to black 5 and as