Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 69
ver, including the permanent horse-shoemagnetj the pole-pieces, the binding posts and the leading-in wires,are moulded in a shell so as to form one integral part. The dia-phragm is held in place by the ordinary ear-piece, which screws inplace as in other receivers. The coils slip on over the… … FIG, 34.—PARTS OF WATCH-C.\SE RECEIVER. The diaphragms used for receivers are made of very soft thinsheet iron; the ferrotype plate formerly used for tin-types in pho-tography being as good material as can be found for this purpose.Some companies, however, are using tinned-iron diaphragms,…
Telephone
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