Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)
United States. Bureau of the Census, Steuart, William Mott, 1861-, Martin, Thomas Commerford, 1856-1924, Abbott, Arthur Vaughan, 1854-, Mayer, William · Washington : Govt. Print. Off. · leaf 54
end ofeach hour a clerk makes a memorandum of the num-ber of the jack in which each peg stands and removesthe peg to the zero jack, thus making a record of thenumber of calls that each operator has answered.Such a traffic enumeration is termed a peg count. For toll line work, or measured service,…
Telephone · Telegraph · Fire alarms
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