Handbook for the Use of Electricians in the Operation And Care of Electrical Machinery And Apparatus of the U.S. Seacoast Defenses
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To quickly assess the difficulty of the text, read a short excerpt:
When a positive current enters the magnet coils, one iV-pole is neutral- ized and the other is made stronger so that the latter attracts its armature end.
A negative C makes the other iV-pole attract its armature end, and so on. As there is no spring to be overcome, a polarized relay is very sensitive and deserves attention on account of its importance in the service. For the magneto which generates the alternating -i- and — currents, see page 46.
(B) MAGNETO, BELI., AND SECONDARY COII.S.
The m...agneto, bell, and secondary coils of each station are joined to mains — In parallel or bridge (fig. 171.) In series (fig. 172).
17 J. Parallel Telephone bvaiion.
172. Series Telephone Station.
The three main coils have few turns of wire and low resistance, and operate in series.
Majjncto circuit, normally short-circuited, has the sliunt opened autdniaticiilly at A by the crank shaft slidini; to the riijlit }^ inch when rotated, so that the ringing current goes to line.
1. All bells are permanently bridged.
What to read after Handbook for the Use of Electricians in the Operation And Care of Electrical Machinery And Apparatus of the U.S. Seacoast Defenses?
You can find similar books in the "Read Also" column, or choose other free books by United States. War Dept to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
When a positive current enters the magnet coils, one iV-pole is neutral- ized and the other is made stronger so that the latter attracts its armature end.
A negative C makes the other iV-pole attract its armature end, and so on. As there is no spring to be overcome, a polarized relay is very sensitive and deserves attention on account of its importance in the service. For the magneto which generates the alternating -i- and — currents, see page 46.
(B) MAGNETO, BELI., AND SECONDARY COII.S.
The m...agneto, bell, and secondary coils of each station are joined to mains — In parallel or bridge (fig. 171.) In series (fig. 172).
17 J. Parallel Telephone bvaiion.
172. Series Telephone Station.
The three main coils have few turns of wire and low resistance, and operate in series.
Majjncto circuit, normally short-circuited, has the sliunt opened autdniaticiilly at A by the crank shaft slidini; to the riijlit }^ inch when rotated, so that the ringing current goes to line.
1. All bells are permanently bridged.
What to read after Handbook for the Use of Electricians in the Operation And Care of Electrical Machinery And Apparatus of the U.S. Seacoast Defenses?
You can find similar books in the "Read Also" column, or choose other free books by United States. War Dept to read onlineMoreLess
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