Steam-Age Tech

STEAM-AGE FOUNDATIONS

Traveling Technology Workshop

Morse Code Keyer

Presentations:


= Telegraph & Telephone =


Electromagnetic Communication


For most of us, if you asked, one of the hardest inventions to be without would be our telephones; whether land-line, mobile or even smartphone, they all rely on electromagnetic communication. From the first practical application of electricity - the telegraph, to the entire computer age, we are looking at developments largely using the same fundamental technology. We will focus on pre-transistor developments, starting with the principles of electricity and electromagnets, and working our way to telephones with a brief nod to television and computers.

Technology Principles:

  • Electricity
    • Static
    • Lightning
    • Generated / Transmission
  • Electromagnetism
    • Motors
    • Generators
  • Inductance => Microphone / Speaker
  • Electric Relay


Program Outline

[ Seminar Format Ca. 45 minutes ]
[ Workshop Format Ca. 90 minutes ]
Workshop Format has more hands-on time for the participants

Electricity and Electromagnets

  • The Early discoveries
  • 1753 "Scots Magazine" dedicated wire/letter telegraph
  • 1800 Volta - Voltaic Pile [Practical Demo]
  • 1820 ├śrsted - Electro Magnetic Fields
  • 1821 Faraday - Electro Magnetic Rotation (proto-motor) [Practical Demo]
  • 1823 Ronald - "Descriptions of an Electrical Telegraph"
  • 1825 Sturgeon - Electromagnet [Practical Demo]
  • 1830 Joseph Henry - Telegraph (electric bell)
  • 1831 Faraday - Electromagnetic Induction [Practical Demo]
  • 1835 Henry & Davy - Electric Relay
  • 1837 Cooke & Wheatstone - First Commercial Telegraph
  • 1837 Morse & Vail - Morse Telegraph [Practical Demo]
  • 11 January 1838 - First Morse Transmission
  • 1850 Brett - First undersea cable England to France
  • 1866 - Trans-Atlantic Cable

Morse Printers 1846 Bain - Chemical Printer 1855 Hughes - Printing Telegraph 1874 Baudot - Automatic recognition of 5 character code (first machine code)

[Hands-On - Workshop only]

  • Electromagnets
  • Telegraph - using original equipment

Telephone

  • An idea whose Time had Come
  • 1844 Manzetti - Proposes idea of Speaking Telegraph
  • 1854 Bourseul - "Electric Transmission of Speech"
  • 1861 Reis - Introduces a Make-Break telephone
  • 1871 Meucci - Patent Caveat No. 3335 "Sound Telegraph"
  • 1875 Bell - U.S. Patent 161,739 "Transmitters and Receivers for Electric Telegraphs" with vibrating steel reeds
  • 1877 Edison files for a patent on a carbon (graphite) transmitter

Closed Circuit Telephone - [Practical Demo]

Telephone Exchanges

  • Manual Connections
  • 1908 Kruckow - Introduces the Dial-Tone Hildesheim, Germany
  • 1940s Bell System establishes a uniform system of Exchange Codes within Area Codes
  • 1940s Bell System begins implementing Dial Tone
  • Automatic Switching with Electromagnets
  • Computer Switching

[Hands On - Workshop only]

  • Simple Microphone / Speaker
  • Closed loop Phone system
  • Dialtone Demo



Page last modified on February 18, 2019, at 03:20 AM
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