Humidity rippled, lightly character-soiled covers with very worn edges and corners; The geophone is actuated solely by means of sound waves transmitted through earth or rock; Its uses include locating trapped miners, detecting leaks in buried water mains, determining the limits of active fires in sealed areas, and predicting possible cave-ins and mining disasters before they happen; 33p. Size: 8vo - Over 7 3/4" - 9 3/4 " Tall. Bestandsnummer des Verk�ufers AC2580

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Bibliografische Details

Titel: Application of the Geophone to Mining ...

Verlag: Department of the Interior, Bureau of Mines, Washington, DC

Erscheinungsdatum: 1922

Einband: Wraps

Illustrator: Photographs and Drawings

Zustand: Good

Auflage: First Edition.

Art des Buches: Paperback

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