Various Sounds from Strowger Equipment

All tones are produced by a Ring Generator; this consists of a DC motor connected to an AC generator; this gives the basic fixed tones. Via some gearing, various cams, each with different interruptions on their circumferance then rotate, making and breaking various contacts, which gives the distinctive cadences. These are all genuine recordings of Strowger equipment. A group and a final Selector stepping. The subscriber dials '958'. Old-Style dialtone Ringing tone Line Busy Tone Number Unobtainable (NU) Tone Telephone Bell Ringing

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