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Polarized Ringer

Polarized Ringer.jpg Remaining Drawings from U. S. PatentThumbnailsType of Magneto TelephoneRemaining Drawings from U. S. PatentThumbnailsType of Magneto TelephoneRemaining Drawings from U. S. PatentThumbnailsType of Magneto TelephoneRemaining Drawings from U. S. PatentThumbnailsType of Magneto TelephoneRemaining Drawings from U. S. PatentThumbnailsType of Magneto Telephone
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If an electromagnet, a permanent magnet, and a pivoted armature be related to a pair of gongs as shown , a polarized ringer results. It should be noted that a permanent magnet has both its poles presented (though one of the poles is not actually attached) to two parts of the iron of the electro-magnet. The result is that the ends of the armature are of south polarity and those of the core are of north polarity. All the markings relate to the polarity produced by the permanent magnet. If, now, a current flow in the ringer winding from plus to minus, obviously the right-hand pole will be additively magnetized, the current tending to produce north magnetism there; also the left-hand pole will be subtractively magnetized, the current tending to produce south magnetism there. If the current be of a certain strength, relative to the certain ringer under study, magnetism in the left pole will be neutralized and that in the right pole doubled. Hence the armature will be attracted more by the right pole than by the left and will strike the right-hand gong. A reversal of current produces an opposite action, the left-hand gong being struck. The current ceasing, the armature remains where last thrown.

Author
Cyclopedia of Telephony & Telegraphy Vol. 1
A General Reference Work on Telephony, etc. etc.
By Kempster Miller
George Patterson
Charles Thom
Robert Millikan
Samuel McMeen
Available from gutenberg.org
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590*754
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