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Keywords:
ELECTRIC,
ELECTRICITY,
TELEGRAPHS,
TELEGRAPHY,
IMPROVEMENT,
CONSTRUCTION,
COMMUNICATIONS,
HISTORY,
SIGNALS,
SEMAPHORE,
ELECTROMAGNETISM,
DEFLECTION,
MAGNETIC,
MAGNETISM,
NEEDLES,
BATTERIES,
WORKING,
WIRE,
INSULATION,
INSULATORS,
GUTTA PERCHA,
INSTRUMENTS,
PRINTING,
CURRENTS,
GALVANIC,
MAGNETS,
ARMATURES,
TRANSMISSION,
COILS,
ELECTROMAGNETS,
POLES
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© Thomas Telford and ICE
1852
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