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  • Early Manufacturers of Telegraph and Electrical Apparatus
    The following article was originally published in the Telegraph and Telephone Age - February 16, 1918 It probably represents the earliest list of telegraph manufacturers that was compiled It includes nearly sixty firms and people associated with the U S telegraph manufacturing industry
  • Telegraph-History
    When the Telegraph Came to California Two articles by James Gamble from The Californian magazine, 1881 : Early Reminiscences of the Telegraph on the Pacific Coast The first telegraph lines in California
  • Insulator (electricity) - Wikipedia
    An electrical insulator is a material whose internal electric charges do not flow freely; very little electric current will flow through it under the influence of an electric field This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily The property that distinguishes an insulator is its resistivity; insulators have higher resistivity than
  • PRE-1881 TELEGRAPH EQUIPMENT - W1TP
    PART I 50 THE ORIGINAL MORSE TELEGRAPH KEY was actually a notched piece of metal called a Portrule It was pulled along and the parts of the metal that were not notched made contact with another piece of metal, completed the electrical circuit, and produced the dots and dashes of the Morse Code
  • Electrical Insulation - Edison Tech Center
    Types and history of electrical insulation 2 ) List of Common Insulating Materials Solids Clay (ceramic)(porcelain) - This is the standard material for high voltage and RF insulators Plastics - PVC, Cresyl Pthalate, DEHP and other plastics replaced rubber as an insulator for wires and other parts PVC and nylon are now standard in most types of wire
  • TELEGRAPH COLLECTORS REFERENCE CD (2nd Edition)
    TELEGRAPH CATALOGS: 23 1848 DANIEL DAVIS TELEGRAPH AND ELECTRICAL APPARATUS CATALOG ( shows the amazing variety of electrical apparatus sold by Davis Davis made some of the instruments for Morse's Washington-Baltimore telegraph line
  • Granville T. Woods - Inventor - Biography
    Early Inventing Career Living in Cincinnati, Woods eventually set up his own company to develop, manufacture and sell electrical apparatus, and in 1889, he filed his first patent for an improved
  • History of Electrical Systems and Cables - myinsulators. com
    Early Telegraph Cables In the early years of the eighteenth century, many natural philosophers experimented with electricity, with a view to establishing its applications




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