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PHYSICS

ADVANCED

COURSE

BY

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GEORGE F. BARKER

PROFESSOR OF PHYSICS IN THE UNIVERSITY OF PENNSYLVANIA

THIRD EDITION, REVISED

NEW YORK

HENRY HOLT AND COMPANY

1892

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THE NE 3.
PUBLIC LIBRAT?

ASTOR, I ENS TILDEN FOUNDAT! R

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/SOUTELISABET

Denvel HORIZONTAL

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The Isogonio Curves or Lines, of Equal Magnetic Declination, are irawn for each de number and East Declination by a Minus sign. To he right of the Agonic or Zero Curve the north end

The Isoclinic Lines or Lines of Equal Maguetic Dip are drawn for intervals of tyvo degi
The Isodynamic Lines or Lines of Equal Horizontal Component of Magnetic Iu tensity

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