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 74
the head. The sides of the head are provided withbinding posts, which project, air tight, through thesides. After each conductor is run to its appropriatebinding post and soldered, the head cover is screweddown upon a rubber gasket, sealing the cable. Thepot head is the cheaper device. It is made… … TELEPHONE CONDUITS NEAR STREET RAILWAY TRACK.
Telephone · Telegraph · Fire alarms
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