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  • Early Telegraph and Electrical Manufacturers
    An early list of telegraph and electrical manufacturers T hose who have had the good fortune to come into possession of an early make of telegraph relay, sounder or key are, in many instances, at a loss in trying to establish the date of manufacture of their prize While, in most cases, the instrument bears the name of the manufacturer, there is no clue as to the year in which it was made
  • 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
  • History of J. H. Bunnell Company
    History of J H Bunnell Company based upon a presentation by Dr Joseph Jacobs at the 1994 Antique Wireless Association Conference Jesse Bunnell, founder of the company that manufactured telegraph apparatus and other electrical supplies, was a kind of folk hero, a man about whom songs and stories should be written
  • Insulator (electricity) - Wikipedia
    Physics of conduction in solids Electrical insulation is the absence of electrical conduction Electronic band theory (a branch of physics) says that a charge flows if states are available into which electrons can be excited This allows electrons to gain energy and thereby move through a conductor such as a metal If no such states are available, the material is an insulator
  • Granville T. Woods - Inventions, Timeline Significance . . .
    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
  • Incandescent light bulb - Wikipedia
    An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated to such a high temperature that it glows with visible light (incandescence) The filament is protected from oxidation with a glass or fused quartz bulb that is filled with inert gas or a vacuum In a halogen lamp, filament evaporation is slowed by a chemical process that
  • Electricity in South Africa - Early Years
    The Encyclopaedia of Southern Africa records that "an electric device" was used in South Africa in about 1809 The first electric telegraph system, operated between Cape Town and Simon’s Town, was introduced in 1860 An early arc light was demonstrated in 1860 and the telegraph system was used for a time signal in 1861 In 1881, the local railway station in Cape Town was illuminated by means

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