Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 68
country to a considerable 46 AMERICAN TELEPHONE PRACTICE. extent. This is of the bipolar type. The magnets are secured tothe metal cup by means of two screws shown in the figure, eachextending transversely through the case and into the magnets.The holes in the case through which these screws… … FIG. 33.—MUKUOCK SOLID RECEIVER. The inclosing tube for the magnets is of brass covered by a thinlayer of insulating material, usually hard rubber, but sometimes ofleather. This tube is also held in positiofi by the screws beforementioned. A piece of hard rubber projects between the two bind-ing…
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