ratus fail in transmission or recording. third system. The number on the receiving instrument after register- -The Stroud telephone meter, which we illustrate, is made by the National Measured Service Company, of ing, added to the previous total, should tally with the Chicago, and is designed to… … number forward and rotates the camwheel, h, to
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-46-8.webp)
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