. Electrical world. ever at atelephone connects its No. I wire to the common return wire. Asthe brush frame of the decimal indicator is normally revolving atthe rate of 15 , each segment of its line ring comes under thebrush that travels on that ring once every four seconds. When thebrush on the line ring reaches a segment whose connected wire, theNo. I wire of a telephone, is joined to the common return wire atthat telephone, the poles of the storage battery are united throughthese wires and the winding of an electromagnet. The action ofthis electromagnet releases the clutch through whi
. Electrical world. ever at atelephone connects its No. I wire to the common return wire. Asthe brush frame of the decimal indicator is normally revolving atthe rate of 15 , each segment of its line ring comes under thebrush that travels on that ring once every four seconds. When thebrush on the line ring reaches a segment whose connected wire, theNo. I wire of a telephone, is joined to the common return wire atthat telephone, the poles of the storage battery are united throughthese wires and the winding of an electromagnet. The action ofthis electromagnet releases the clutch through which the brush frameof the decimal indicator is driven, and this frame comes momen-tarily to rest with its brush on the segment of the line ring to whichthe No. I wire of the calling telephone is connected. In this posi-tion of the brush frame certain circuits are closed by the brushesthat rest on segments of the other commutator rings of the decimalindicator, and current; in the-^e circuits actuate magnets that bring. Fig. 6.—Front of Section. nection of a new section at an exchange it is only necessary to bringthe two wires from each of its 100 telephones to the terminals ofwires in the fibre strips, and to join the new section to the othersby a cable of forty wires that also come to the fibre strips. In each sectional division, the piece of apparatus which receivesthe first impulse from a calling telephone, and sets in motion thechain of automatic operations that completes the desired connection,is called the decimal indicator. This indicator includes threecommutators of 100 segments each, one commutator of ten segments,and two battery contact rings. These commutators and rings areheld in a stationary position about a central revolving shaft, and aconcentric frame carrying brushes is driven by this shaft through afriction clutch. One of the 100 segment commutators on a decimalindicator is called the line ring, and the No. i wire from each tele-phone of the section is connect
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883