Matches in DBpedia 2015-10 for { ?s ?p "A hydraulic telegraph is the name given to two different hydraulic-telegraph telecommunication systems. The earliest one was developed in 4th century BC Greece, while the other one was developed in 19th century AD Britain. The Greek system was deployed in combination with semaphoric fires, while the latter British system was operated purely by hydraulic fluid pressure.Although both systems employed water in their sending and receiver devices, their transmission media were completely different."@en }
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- Hydraulic_telegraph comment "A hydraulic telegraph is the name given to two different hydraulic-telegraph telecommunication systems. The earliest one was developed in 4th century BC Greece, while the other one was developed in 19th century AD Britain. The Greek system was deployed in combination with semaphoric fires, while the latter British system was operated purely by hydraulic fluid pressure.Although both systems employed water in their sending and receiver devices, their transmission media were completely different.".