University Library, University of Illinois at Urbana-Champaign
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Creator
Ronalds, Francis, Sir, 1788-1873
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Subject
Communication
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Electric telegraph
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Hammersmith, England
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Inventions
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Scientific inventions
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Telegraph
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Telegraph cable
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Still image
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Telegraph Line
Telegraph Line
Image |
Teaching with Digital Content (Cultural Heritage Community)
A twelve-inch length of wire with two sections of glass tubing used as insulation. The glass tubes are sealed at the joints with wax.
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