System of Sending Messages Along a Wire

This page is the CodyCross answer for the clue below from Inside the Spaceship, Group 1200, Puzzle 2 (Relax and Enjoy).

Question is: System of Sending Messages Along a Wire

and the answer is: TELEGRAPH

Word Meaning:

TELEGRAPH — (uncommon) Synonym of telegraphy, any process for transmitting arbitrarily long messages over a long distance using a symbolic code.

Definitions from Wiktionary.

System of sending messages along a wire — CodyCross Answer | CodyCross Solutions