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.