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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1846 Excerpt: ... the tension of its aether, it becomes more nearly equal to the tension of the aether of the experimenter's body, immission is both less copious and less energetic--the sensation of heat is less. With the silver it is different, it expands not so readily and largely as the air, it sustains tension, hence a more energetic and full inflowing of aether with a conformable result; the same in a less degree may be said of the other rods. But an objection presents itself: glass expands less than silver and yet transmits less heat. This must be attributed to arrangement of particles; in metals it seems quasi-channels exist for the passage of heat; in glass and many other substances these seem to be imperfect or obstructed by peculiar conformation. Even upon the surfaces of bodies, the air in contact seems to form with their peculiarities of structure channels more or less favourable to transmission of aether. Wood expands but little, it also transmits heat badly, both are due to porosity, the interexistcnt air expands and diverts the tensional force from it. Liquids are so easily expanded, and their particles are so exceedingly moveable inter se, that there is only one direction, namely the downward, in which their transmitting ability can be tested; it has been found that in them this ability is very feeble, so feeble that it has been altogether denied in all, except one--mercury. Now, why do not liquids transmit heat downwards? Why does mercury transmit it in that direction? In all liquids, except mercury, cohesive attraction is weak; at the surface a low degree of aethereal tension separates their particles and places them under the influence of the centrifugal force; this separates them still farther, causes increase of bulk, and a demand for aether, thus the a...
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