Image from page 507 of "The Bell System technical journal" (1922)
Identifier: bellsystemtechni02amerrich
Title: The Bell System technical journal
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: BayNet
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lying at a distance greater than 5AB from the line AB connect-ing the electrodes. If a uniform radial flow of current / in the horizon plane con-verging on the point A is combined with the uniform radial flowin the earth outward from A, we have a closed flow which is sym-metrical about the vertical axis through A. Below the horizonplane the magnetic lines of force will be horizontal circles and themagnetic force at any point distant t\ from A, a being the angleincluded between rx and the nadir, is H = 2I(l — cos a)/(rjsin a) 4 BELL SYSTEM TECHNICAL JOURNAL = 21 rrl tan (a/2). Above the horizon plane there is no magneticfield, since any magnetic lines of force are, by symmetry, horizontalcircles and the intensity is zero, since there is no current threadingany horizontal circle above the surface of the earth. Superposing this closed flow and a similar closed flow through Bfrom the earth to the horizon plane, we obtain a closed flow from A -7 -.6 -.5 -A I .2 .3 A .5 .6 .7 & 9 1.0.
Text Appearing After Image:
Fig. 1—Flow and equipotential lines on the earths surface for an earth return flowfrom A to B. C/I is the fraction of the current flowing in the earth outside theflow surface of revolution; V/I is the resistance to the flow of the portion of theearth lying between the equipotential surface of revolution and the mid or zero po-tential plane, if the earths resistivity is p = 2w. The flow and equipotential linesthrough each point on the dotted curve are perpendicular and parallel, respectively, to AB to B in the earth and back from B to A in the horizon plane. Themagnetic field for this closed flow, being the sum of the magneticfields for the component flows, will be zero above the horizon plane,while below it will consist of lines of force in horizontal planes. This. MUTUAL IMPEDANCES OF GROUNDED CIRCUITS 5 result also applies to any closed flow which does not extend abovethe horizon plane and may be resolved into any number of com-ponent flows, each of which is radially symmetrical a
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Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
Image from page 507 of "The Bell System technical journal" (1922)
Identifier: bellsystemtechni02amerrich
Title: The Bell System technical journal
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: BayNet
View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing Before Image:
lying at a distance greater than 5AB from the line AB connect-ing the electrodes. If a uniform radial flow of current / in the horizon plane con-verging on the point A is combined with the uniform radial flowin the earth outward from A, we have a closed flow which is sym-metrical about the vertical axis through A. Below the horizonplane the magnetic lines of force will be horizontal circles and themagnetic force at any point distant t\ from A, a being the angleincluded between rx and the nadir, is H = 2I(l — cos a)/(rjsin a) 4 BELL SYSTEM TECHNICAL JOURNAL = 21 rrl tan (a/2). Above the horizon plane there is no magneticfield, since any magnetic lines of force are, by symmetry, horizontalcircles and the intensity is zero, since there is no current threadingany horizontal circle above the surface of the earth. Superposing this closed flow and a similar closed flow through Bfrom the earth to the horizon plane, we obtain a closed flow from A -7 -.6 -.5 -A I .2 .3 A .5 .6 .7 & 9 1.0.
Text Appearing After Image:
Fig. 1—Flow and equipotential lines on the earths surface for an earth return flowfrom A to B. C/I is the fraction of the current flowing in the earth outside theflow surface of revolution; V/I is the resistance to the flow of the portion of theearth lying between the equipotential surface of revolution and the mid or zero po-tential plane, if the earths resistivity is p = 2w. The flow and equipotential linesthrough each point on the dotted curve are perpendicular and parallel, respectively, to AB to B in the earth and back from B to A in the horizon plane. Themagnetic field for this closed flow, being the sum of the magneticfields for the component flows, will be zero above the horizon plane,while below it will consist of lines of force in horizontal planes. This. MUTUAL IMPEDANCES OF GROUNDED CIRCUITS 5 result also applies to any closed flow which does not extend abovethe horizon plane and may be resolved into any number of com-ponent flows, each of which is radially symmetrical a
Note About Images
Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.