![SS radio operator with two-way radio and telegraph](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/3/34/SS_radio_operator_with_two-way_radio_and_telegraph.jpg/revision/latest/scale-to-width-down/180?cb=20210304150322&path-prefix=en)
Telegraph on table (between map and left hand)
The telegraph was a communications technology developed on Earth, during the 19th century.
The 2269 Excalbian recreation of Abraham Lincoln referred to Uhura's communications system as a "voice telegraph device." (TOS: "The Savage Curtain")
In 2369, Worf used components of a telegraph, in combination with his communicator, to create a personal deflector shield against projectiles in the damaged holodeck simulation of Deadwood. (TNG: "A Fistful of Datas")
While a salvage team lead by Miles O'Brien was stranded on Empok Nor in 2373, it was suggested that if the field coils in the deflector grid were modified to emit a series of covariant pulses, while the power was boosted to the induction grid, they could use the station "like an old-fashioned telegraph and tap out an SOS" to send to Deep Space 9. (DS9: "Empok Nor")