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By Edwin James Houston

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Id. A form of Gravity- Drop Annunciator. gravity-drop annunciator is shown The armature mechanism for the in Fig. 1 6. release of the drop will be understood by an inspection of the drawing. Annunciator, An Hotel ciator connected with the different annunrooms of a hotel. A hotel-annunciator a return bell and is generally provided with guest-call. Annunciator, Annunciator, Needle ciator, the indications of the movements An House ciator connected with the rooms annun- of a house. An annunwhich are given by of a needle instead of the fall of a drop.

23, together with the disposition of the coils and their connection to the segments of the commutator. Armature, Shuttle A variety of drum armature in which a single coil of wire is wound in an H -shaped groove formed in a bobbin shaped core. old form of Siemens-armature. The tro-magnet, or electro-magnets, may cause either attraction or repulsion, according as the adjacent poles are of opposite polarity or are of the same A closed Armature, Single-Loop conducting circuit consisting of a single loop, capable of revolving in a magnetic field so as polarity.

Electric its do not produce but differences of potential rents, coils are placed. not reversed during of the machine. bridge. A and B, are the proportionate term sometimes employed to represent a dynamo-electric machine, voltaic cell or other electric source, by means of which is in a ring, provided with a number spaces between which the armature Fig. 24, resistance, the Arrangement or Deyice, Electromotiye an approximately spherical armature when wrapped. Armature, Toothed-Ring is known resistance placed in the arms.

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