The Earth; Its Life And Death

Paperback | January 11, 2012

byAlphonse Berget

not yet rated|write a review
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1915. Not illustrated. Excerpt: ... from a purely theoretical point of view, and has given a mathematical analysis of it which has thrown much light upon the subject. By grouping together all the observations made up to the year 1893, he deduced the important result that the movement of the pole could be expressed by a formula containing two terms; the amplitudes of these terms, amplitudes which give the intensity of the phenomenon, vary, in the case of the first term from Toot to xTM5o of a second of arc, which corresponds to a displacement on the Earth's surface of from 2.64 to 5.70 metres, and for the second term from ^0 to iVjfti of a second, corresponding to a distance of from 3.56 to 4.30 metres. The periods of these two terms are on the average, 430 days for the first and 365 days for the second, that is fourteen and twelve months respectively. It will at once be seen how important this research is. The phenomenon must be produced by the combined effort of two periodical actions, the period of one being fourteen months, that of the other being annual. We have therefore to make a separate study of the two actions. As regards the former there is an astronomical cause. The periodicity of 430 days can be explained by an astronomical residual, arising from the action of the Moon on the equatorial bulge of the Earth. Lord Kelvin and Newcomb have shown that, taken as a whole, the terrestrial globe has an elasticity comparable to that of steel; we shall find an interesting confirmation of this in studying seismic phenomena. Newcomb has shown that if this be so the period of the polar displacement should be 427 days, a figure which agrees remarkably well with the 430 days indicated by Chandler. Furthermore, long-continued observations with tide gauges have demonstrated the fact of the periodical ris...

Pricing and Purchase Info

$21.79 online
$21.95 list price
In stock online
Ships free on orders over $25

From the Publisher

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1915. Not illustrated. Excerpt: ... from a purely theoretical point of view, and has given a mathematical analysis of it which has thrown much light upon the subject. By...

Format:PaperbackDimensions:78 pages, 9.69 × 7.44 × 0.16 inPublished:January 11, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:021707765X

ISBN - 13:9780217077651

Look for similar items by category:

Customer Reviews of The Earth; Its Life And Death

Reviews