Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 210
tube, c, in such manner as to almostcompletely close the magnetic circuit in which the coil is placed. Thelines of force generated by the passage of a current through thecoil follow almost entirely the path provided for them by the shelland the core of the magnet, thus not only producing a very… … FIG. 169.-STRIP OF TEN DROPS. together as desired without producing perceptible cross-talk. Theimpedance due to the great number of turns in the coil, and to theperfect magnetic circuit surrounding the same, is so great that prac-tically no diminution in the strength of speech transmission is…
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