• In 1824 Ignace Chappe attempted to increase interest in using the semaphore line for commercial messages, such as commodity prices; however, the business...
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  • Edebiyat. Schapp, Claude // Brockhaus ve Efron'un Ansiklopedik Sözlüğü : 86 ciltte (82 cilt ve 4 ek). - St.Petersburg. , 1890-1907.
  • Claude Chappe was a French engineer and cleric who converted an old idea into a reality by inventing the semaphore visual telegraph. His brother Ignace Chappe...
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