Identifier: bellvol36systemtechni00amerrich (find matches)
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
Subjects: Telecommunication Electric engineering Communication Electronics Science Technology
Publisher: (Short Hills, N.J., etc., American Telephone and Telegraph Co.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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\. MADEIRA ABYSSALPLAIN 47 .Ab ,A0 L3,0 ;./ , ■■w 25° 20° rinecle.)
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ABYSSAL PLAINS AXIS OF MAXIMUM DEPTH SEA MOUNTS Fig. 6 — Great-cii-cle chart sliowing physiographic provinces and existing submarinecable routes (dotted Hnes). (On this chart any straight Une r-presents a great circle.) r OCEANOGRAPHIC INFORMATION FOR SUBMARINE CABLES 1063 2.4.1 Continental Margins The first area considered is the continental shelf which may be char-acterized as the shallow (0-100 fathoms) submarine terrace borderingthe continents, extending seaward hundreds of miles in some localities.The shelf terminates where the bottom gradient increases suddenlyfrom the shelf average of approximately 0.1° to the continental slopeaverage of more than 4°. This change occurs in depths ranging from20 to more than 100 fathoms. The shelf is a continuation of the coastalplain and displays the same numerous small irregularities as the plain.For example, off the United States east coast — from Cape Cod south— the shelf is relatively flat, but with many small (10-fathom) hills andr

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