Excerpt from On Dew Dr wells' experiments were so simple, and his interpretation of the different phenomena connected with dew so clear, that he has been justly considered the great master of this subject. In his Essay he struck a medium between the two previous theories as to the source of the moisture that forms dew. He did not think with the ancients that it fell from heaven, nor with gersten that it rose from the earth, but that it was simply condensed out of the air in contact with the surfaces of bodies cooled by ...
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Excerpt from On Dew Dr wells' experiments were so simple, and his interpretation of the different phenomena connected with dew so clear, that he has been justly considered the great master of this subject. In his Essay he struck a medium between the two previous theories as to the source of the moisture that forms dew. He did not think with the ancients that it fell from heaven, nor with gersten that it rose from the earth, but that it was simply condensed out of the air in contact with the surfaces of bodies cooled by radiation below the dew-point of the air at the place. This opinion has, so far as I am aware, been generally received up to the present time. Some experiments I have recently made on this subject have caused me to differ entirely from Dr wells as to the source of the vapour that forms dew. As everything written by Dr wells is, so to speak, stereotyped and final, there seems to be the greater reason that any of his conclusions that seem doubtful should be carefully criticised and fully investigated; I shall therefore give an account of the experiments that have caused me to differ from so great an authority. Dr wells thought that almost all the moisture deposited as dew at night was taken up by the air during the heat of the day; so that, according to his idea, vapour ascended from the earth during the day, and again descended and became condensed as dew on the surface of the earth at night. My observa tions have led me to the very opposite conclusion. All my experiments indicate that dew, on, bodies near the surface of the earth, is almost entirely formed from the vapour rising at the time from the ground; at least this would appear to be the case generally in this climate, to which my experiments have been confined. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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