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The Independent Door-Lock

Magnetic Telegraph


  • Departments

    The Scientific American

  • Illustration by Comparison

  • Foreign News

  • Jumble

  • Science of Mechanics

  • Arithmetical

  • Railroad Intelligence

  • The Soldier's Prayer

  • Arts and Trades

  • Geological Gleanings in Mississippi

  • Be Rational and Consistent

  • New Inventions

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