Telegraph
From Tardis Wiki, the free Doctor Who reference
A telegraph was used to send telegrams. In the 1900s, James Skinsale sabotaged the telegraph on Fang Rock to ensure that Henry Palmerdale could not send information about his personal affairs to the mainland, information that would dishonour Skinsale. In doing so, he cut Fang Rock off from outside help when a Rutan attacked. (TV: Horror of Fang Rock) The model was an example of an early Marconi wireless telegraph, able to "send messages a long way". (PROSE: Doctor Who and the Horror of Fang Rock)
The Doctor gave a space-time telegraph to the UNIT, to be used to summon him to Earth in the case of an emergency. (TV: The Day of the Doctor)
