File:Telephones and telegraphs- 1902 - (and Municipal electric fire alarm and police patrol systems) (1906) (14569608690).jpg

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English:

Identifier: cu31924022817674 (find matches)
Title: Telephones and telegraphs: 1902 : (and Municipal electric fire alarm and police patrol systems)
Year: 1906 (1900s)
Authors: United States. Bureau of the Census Steuart, William Mott, 1861- Martin, Thomas Commerford, 1856-1924 Abbott, Arthur Vaughan, 1854- Mayer, William
Subjects: Telephone Telegraph Fire alarms
Publisher: Washington : Govt. Print. Off.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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withstanding they were numericallymuch fewer than the magneto, are of greater impor-tance. Common battery boards are used almostentirely in the larger cities, and hence are utilized bythe bulk of the subscribers in the United States. Statistics of switchhoard equipment.—Tables 3, 5,and 6 contain statistics as to switchboard equipment.In the outlying districts there was a total of 14 boards,of which 12 were magneto and 2 were common battery.These systems had an average of 207 telephones perswitchboard. For continental United States thenumber of switchboards reported as belonging tocommercial systems was 9,954, or 91.4 per cent of thetotal number, while the mutual systems had 942boards, or 8.6 per cent. All the private branchexchange boards, 7,883, were reported for the com-mercial systems. When a comparison is made regarding the switch-board equipment of the Bell and the independentcompanies, as given in Table 6, it is seen that the Bellboards numbered 3,820, and formed only 35.1 per
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CENTRAL AUTOMATIC EXCHANGE, GRAND RAPIDS, MICHIGAN, 6,000 LINE FULL AUTOMATIC.

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