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The author enters into a very detailed description of the construc­tion of the thermometers he employed in these observations, and the precautions he took to ensure their accuracy; and gives tabular records of an extensive series of observations, amounting to a num­ber considerably above ten thousand, with thermometers placed on nearly a hundred different substances, exposed to the open air, under different circumstances, and in various states of the sky, at the Royal Observatory at Greenwich.

On the amount of the radiation of heat, at night, from the earth, and from various bodies placed on, or near the surface of the Earth