First transatlantic telegraph cable

The first transatlantic submarine communications cable was laid from summer 1857 to summer 1858. The first test message exchange was completed on August 13. It lasted three weeks.

• 
  a piece of the cable
• 
  cross section
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  the cable in the belly of the Agamemnon
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  The Agamemnon paying out cable
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  Route
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  Stamp for the 100th anniversary of first contact