An Elementary Treatise on Physical Geography; To Which Is Added a Brief Description of the Physical Phenomena of the United States (Paperback)

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. 1873 Excerpt: ...of air against another or against the earth, to the unequal temperature of different parts of the earth's surface, and to condensation and evaporation of moisture. 4. Manner In which Clonds become electrified.--During clear, dry weather, the air being a non-conductor, its free electricity cannot accumulate so as to acquire great intensity. When, however, clouds form, the particles of water, being distributed through the air, render it a conductor, and the electricity accumulates upon the surface of the clouds uutil a considerable intensity is acquired. 5. Thunder and Lightning.--If two clouds, differently electrified, approach within a certain distance of each other, their electricity begins to accumulate on the sides nearest each other. When this accumulation has become sufficiently intense to overcome the resistance of the non-conducting atmosphere between, an interchange takes place: in the flash and explosion which follow, we have the phenomena of thunder and lightning. The same interchange frequently takes place between a cloud and the earth, in which case the lightning passes upwards and downwards. Thunder is caused by the violent displacement of the air produced by the passage of the lightning, and its rush back again into the partial vacuum created. The lightning is perceived first, because sound travels slower than light. The loudest thunder can scarcely be heard at the distance of ten miles, and is less intense, therefore, than the report from a piece of heavy artillery. 6. According to Arago, there are three kinds of lightning, --zigzag or chain, sheet, and globular. To these are now added heat and volcanic. The rapidity of the movement of a flash of lightning condenses the air immediately in advance of its path, so that great resistance is offere...

General

Imprint:	Rarebooksclub.com
Country of origin:	United States
Release date:	May 2012
First published:	May 2012
Authors:	David M. Warren
Dimensions:	246 x 189 x 5mm (L x W x T)
Format:	Paperback - Trade
Pages:	98
ISBN-13:	978-1-153-82852-9
Categories:	Books > Humanities > History > General Books > History > General
LSN:	1-153-82852-9
Barcode:	9781153828529

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