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Updated: May 10, 2025
As the truth, or rather the falsity, of his pet theory of evolution depended on the satisfactory solution of this vexed problem, it became necessary for him to give his best and entire mental energies to the gigantic task which was, by universal consent, assigned him. The reader shall see how admirably the thermal equator is crossed by Mr.
They were extended to the heat-rays by Edwin B. Frost. Detailed inquiries made at Potsdam in 1892 went to show that, were the sun's atmosphere removed, his thermal power, as regards ourselves, would be increased 1·7 times. They established, too, the practical uniformity in radiation of all parts of his disc.
It has fostered and multiplied a vigorous black race, and engendered a feeble mulatto breed. Many of each of these classes have drifted northward, right in the teeth of thermal laws, to find homes where they would never live by natural election.
Brown, at Tauranga; the comfortable abode of Chapman on Hinemoa's island in Lake Rotorua; the thermal springs which promptly healed the sprains and bruises of the arduous journey; the coloured pools in which healthy Maori children bathed and played; the wheat-fields and the English fruit of the central plateau; the mission stations of Morgan and Ashwell on the Waipa and Waikato; the easy canoe journey down these rivers until once more the western sea was reached: all this was delightful in itself, and prepared the traveller for a keen discussion on Bible translation with the expert Maunsell at the Waikato Heads.
Sir W. Thomson refers to certain investigations which prove that the present thermal condition of the interior of the earth implies either a heating of the earth within the last 20,000 years of as much as 100° F., or a greater heating all over the surface at some time further back than 20,000 years, and then proceeds thus:
Thus, modern inquiries tend to render more and more evident the vastness of the thermal stores contained in the great central reservoir of our system, while bringing into fair agreement the estimates of its probable temperature. This is in great measure due to the acquisition of a workable formula by which to connect temperature with radiation.
This is why things 'fall' under the influence of gravity and 'rise' under the influence of levity.4 How does thermal expansion read as a letter in nature's script when seen in the light of the two contrasting field-concepts? Let us, for simplicity's sake, imagine a spherically shaped metallic body, say, a ball of copper, which we expose to the influence of heat.
Clausius' and Maxwell's explanations of the diffusion of gases, and of thermal conduction in gases, their charmingly intelligible conclusion that in gases the diffusion of heat is just a little more rapid than the diffusion of molecules, because of the interchange of energy in collisions between molecules, while the chief transference of heat is by actual transport of the molecules themselves, and Maxwell's explanation of the viscosity of gases, with the absolute numerical relations which the work of those two great discoverers found among the three properties of diffusion, thermal conduction, and viscosity, have annexed to the domain of science a vast and ever growing province.
There are no lava-streams on the western side of the Ghor, or of the Dead Sea. The outburst of the celebrated thermal springs of Callirrhoë, together with nine or ten others, along the channel of the Zerka Maïn, is a circumstance which cannot be dissociated from the occurrence of basaltic lava at this spot.
In order to learn about these, resort is had to certain instruments which, through the change of the spatial position of a point, allow the onlooker-observer to register changes in the thermal condition of a physical object. An instrument of this kind is the thermometer.
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