. American telephone practice . FIG. 1S4.—TOP VIEW, WTTH COIL REMOVED. manufactured by the American Electric Telephone Company. Inthis drop, which is shown in Figs. 183, 184 and 185, the actuatingcoil is mounted directly above the spring-jack. The coil is inclosedon the sides in a sheet-iron frame or box, C, for lessening the amountof induction between adjacent drops. The armature of the magnetis pivoted at the rear of this shield, and carries a forwardly project-. FIG. 1S5.—TOP VIEW, WITH COIL IN PLACE. ing lever, /, which in turn carries on its forward end a catch for hold-ing the shutter, d
. American telephone practice . FIG. 1S4.—TOP VIEW, WTTH COIL REMOVED. manufactured by the American Electric Telephone Company. Inthis drop, which is shown in Figs. 183, 184 and 185, the actuatingcoil is mounted directly above the spring-jack. The coil is inclosedon the sides in a sheet-iron frame or box, C, for lessening the amountof induction between adjacent drops. The armature of the magnetis pivoted at the rear of this shield, and carries a forwardly project-. FIG. 1S5.—TOP VIEW, WITH COIL IN PLACE. ing lever, /, which in turn carries on its forward end a catch for hold-ing the shutter, d, in its vertical position. On the shutter is placed acam, c. which, when the shutter is down, lies in front of the openingof the jack. The plug shown in Fig. 186 carries an enlargement or MAGNETO SWITCH-BOARD FOR SMALL EXCHANGES. 201 collar, k, which collar engages the cam, c, on the shutter when theplug is inserted into the jack, and forces the shutter into its normalposition. No cut-out is provided for the coil, which is therefore left inseries in the line during a conversation. The coil therefore servesas a clearing-out drop, and when so actuated the cam on the shutterfalls in front of the collar on the plug. When, therefore, the plugis withdrawn from the jack, after the clearing-out signal has beensent, the cam again engages the collar on the plug and the shutteris restored again to its vertical position. The entire structure of the combined drop and
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
