A B C of the telephone; by Homans James E

Author:Homans, James E[dward] 1865- [from old catalog]
Language: eng
Format: epub
Tags: Telephone
Publisher: N[ew] Y[ork] T. Audel & co.
Published: 1901-03-25T05:00:00+00:00

without disturbing the rest of Ihe mechanism, the fiber disc shown at D sufficing to hold it in position in the tube. In action the drop coil is bipolar, tlic core acting as one pole and the iron shell, or sheath, as the other. The shutter is mechan- J ically self-restoring, being restored to its normal position, in I engagement with tlie hook at the end of the armature lever, by I the simple act of raising it in order to insert the plug through 1 the orifice into the jack springs behind. This brings it to the \ position shown in the first figure, which has the plug inserted | and the shutter up and engaged. The tube of the jack has two ' contact springs, at top and bottom, as shown, to make positive tip and sleeve connections with the plug.

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IMPROVED SWITCHBOARDS.

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Operation of the Ringing Circuit. —The operation of this drop-jack shows it to be one of the most completeand ingenious switchboard contrivances on the marltet. The insertion of a plug between the jack springs bridges the drop coii and makes

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