Changes

| 1767 || Semaphore invented || Richard Edgeworth || <ref name="dogssemaphore">{{cite web |url=http://www.definitions.net/definition/semaphore |accessdate=December 30, 2017}}</ref> |||-| 1774 || Early telegraph invention invented || Georges-Louis Le Sage || One wire each for 26 letters, ran between two rooms in same house<ref name="semaphore">{{cite web |url=https://www.sciencesource.com/p/16844756/Le-Sage-Early-Electric-Telegraph-9N3574.html |accessdate=December 30, 2017}}</ref>|-|