KnowraElectrical telegraphLinked fromLinked fromThe 14 pages that link to Electrical telegraph, each with the reason it gives.All 14Broader topic 5Narrower topic 6Compared with 3Wireless telegraphyCompared with: It carries similar coded messages, but its signals travel along wires rather than through space.Optical telegraphCompared with: Electrical telegraphy replaced visible relays with signals that did not require station-to-station visibility.Carrier pigeonCompared with: The telegraph sent messages both ways without relying on a bird's return journey.