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"Good Lord, look at the heat that's available!" I said, getting really excited now. Farnsworth was still smiling, very pleased with himself. "I suppose you could put this thing in a box, with convection fins, and let it bounce around inside " "I'm way ahead of you," I said. "But that wouldn't work.
But the continuous radiation of the surface-heat into space would produce continuous contraction, while the convection of the interior heat would tend to increase the thickness of the outer solid shell; and this, ever pressing with increasing force on the interior molten mass, would result in frequent ruptures of the shell, and the extrusion of molten lava rising from below.
The reason is, that the old open fireplace has been supplanted by less expensive modes of heating, destructive to health; and science has but just begun experiments to secure a remedy for the evil. The open fire warms the person, the walls, the floors and the furniture by radiation, and these, together with the fire, warm the air by convection.
And here we may note a serious objection to the heating of a bath by convection; for while the head may be in a high degree of heat the feet are in comparatively cool air, whereas, if possible, it should be just the reverse. In convected heat, this of course applies in its entirety, as where so-called radiant heat is employed the evil is not quite so marked.
True, the percentage of energy received by convection was small compared to that received by radiation; but it was also wildly variable. As a biological cultural medium, the hydraulic system provided a basis for both air restoration and food supplies.
According to Crookes it possesses also the singular property of carrying with it electric charges. This convection of negative electricity by the cathode rays seems quite inexplicable on the hypothesis that the rays are ethereal radiations. Nothing then remained in order to maintain this hypothesis, except to deny the convection, which, besides, was only established by indirect experiments.
These souls are intermingled in a chaotic stream that I may liken to the streaming currents of heated air in convection from a source of heat upon our earth, and this continuous tide is caught in a great spherical chamber or a series of chambers extending over five miles around the bald summit of this eminence.
All these conditions the contour of the earth; the uneven character of the moisture in the air; the inequalities of the convection currents; and the unstable, tenuous, elastic nature of the atmosphere, make the trials of the aviator a hazardous one, and it has brought out numerous theories connected with bird flight.
HEAT IN AIR. Heat is transmitted through the air by what is called convection, that is, the particles of the air transmit it from one point to the next. If a room is closed up tight, and a little aperture provided so as to let in a streak of sunlight, it will give some idea of the unrest of the atmosphere.
We'll be cooled by conduction and convection." As the others got the suits ready, he lowered the ship gently to the snowy ground. It sank into nearly ten feet of snow. He turned on the powerful searchlight, and swept it around the ship. Under the warm beams, the frozen gasses evaporated, and in a few moments he had cleared the area around the ship. Morey and the others came back with their suits.
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