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. 1898 Excerpt: ...ascending air currents which are the result of local convection. Electricity.--The subject of atmospheric electrification is one about which comparatively little is known, and the phenomena which have appeared in the course of the observations now under consideration, have merely served to add new complications to the ...
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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. 1898 Excerpt: ...ascending air currents which are the result of local convection. Electricity.--The subject of atmospheric electrification is one about which comparatively little is known, and the phenomena which have appeared in the course of the observations now under consideration, have merely served to add new complications to the situation, rather than to unravel any of the mysteries already existing. Previous investigators have shown, in a general way, that the potential becomes greater as we ascend from the earth, and Mr. McAdie has attempted to ascertain the exact mathematical ratio of this change in volts per unit of distance. Prof. Mendenhall has shown that, near the surface of the earth, the potential often changes rapidly over a very wide range from hundreds of volts in the positive direction to a similar extreme in the negative. It is hoped that the kite will eventually add much to the limited knowledge now possessed of this subject. The steel pianoforte wire which is used in flying the kites is a good conductor of these high pressure charges, it having a resistance of only about.16 ohm per foot, and there have been but few ascensions of any considerable altitude during which it was not possible to obtain quite a shock by breaking the ground connection and touching the wire with the hand. During the cool days in May the current received indicated that the wire was being continuously electrified just as if every particle of air impinging upon it communicated to it a minute electrical charge. With the advance of summer, the charges showed a decided tendency to come in sudden, impulsive rushes, with intermissions of greater or less duration between them. On several occasions there were evidences that an upper stratum of air was highly electrified, while above and ...
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Add this copy of The University of Tennessee Record; Volume 7 to cart. $63.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2019 by Wentworth Press.
