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Introduction |
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Fire signals and beacons |
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The ''hydraulic telegraph'' of Aeneas |
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"Acoustic telegraph" |
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Cryptic relay (Laconian) |
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Aeneas' cryptographic disc |
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Twofold waxed plates |
![]() |
Introduction |
![]() |
Fire signals and beacons |
![]() |
The ''hydraulic telegraph'' of Aeneas |
![]() |
"Acoustic telegraph" |
![]() |
Cryptic relay (Laconian) |
![]() |
Aeneas' cryptographic disc |
![]() |
Twofold waxed plates |