Hydraulic telegraph


Hydraulic telegraph

The hydraulic telegraph was a semaphore system invented in the 4th century BC by Aeneas Tacticus; according to Polybius, it was used during the First Punic War to send messages between Sicily and Carthage.

The system involved identical containers on separate hills; each container would be filled with water, and a vertical rod floated within. The rods were inscribed with various predetermined codes.

To send a message, the sending operator would use a torch to signal the receiving operator; once the two were synchronized, they would simultaneously open the spigots at the bottom of their containers. Water would drain out until the water level reached the desired code, at which point the sender would lower his torch, and the operators would simultaneously close their spigots.

External links

* [http://www.ote.gr/oteweb/english/communication/t_museum1.htm Greek Museum of Telecommunications]
* [http://www.connected-earth.com/Galleries/Telecommunicationsage/Thetelegraph/Firststeps/index.htm Connected Earth]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Telegraph (disambiguation) — Telegraph may be:Telegraphy, class of means of long distance communication: *Electrical telegraph, a form of telegraph that uses electric signals *Optical telegraph, a semaphore based system *Hydraulic telegraph, a telegraph based on seeing how… …   Wikipedia

  • Electrical telegraph — A printing electrical telegraph receiver, and a transmitter key at bottom right An electrical telegraph is a telegraph that uses electrical signals, usually conveyed via telecommunication lines or radio. The electromagnetic telegraph is a device… …   Wikipedia

  • Russian–American Telegraph — Painting of men working on the Collins Overland telegraph line, by John Clayton White. The Russian–American Telegraph, also known as the Western Union Telegraph Expedition and the Collins Overland Telegraph, was a $3,000,000 undertaking by the… …   Wikipedia

  • Nippon Telegraph and Telephone — NTT redirects here. For other uses, see NTT (disambiguation). Nippon Telegraph and Telephone Corporation 日本電信電話株式会社 Type Public Traded as TYO …   Wikipedia

  • New England Telephone and Telegraph Company — The New England Telephone and Telegraph Company was a very early company set up to develop the then new telephone. New England Telephone and Telegraph lasted only a year as a separate entity, from 1878 to 1879, and had no direct relationship with …   Wikipedia

  • Maritime Telephone and Telegraph Company — Former MT T Logo Last MTT Logo Maritime Telephone and Telegraph Company ( …   Wikipedia

  • Telecommunication — A parabolic satellite communication antenna at the biggest facility for satellite communication in Raisting, Bavaria, Germany …   Wikipedia

  • Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …   Wikipedia

  • Deepwater Horizon oil spill — 2010 oil spill and BP oil spill redirect here. For other oil spills in 2010, see 2010 oil spill (disambiguation). For the 2006 oil spill involving BP, see Prudhoe Bay oil spill. For the drilling rig and explosion, see Deepwater Horizon… …   Wikipedia

  • Concorde — For other uses, see Concorde (disambiguation). Concorde Role Supersonic airliner …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.