4. Telegraph | Invention, History, & Facts | Britannica
Link: https://www.britannica.com/technology/telegraph
Description: A telegraph is a device or system that transmits information by coded signal over distance. Learn about the preelectric and electric telegraphs, their inventors… telegraph, any device or system that allows the transmission of information by coded signal over distance. Many telegraphic systems have been used over the centuries, but the term is most oft…
telegraph, any device or system that allows the transmission of information by coded signal over distance. Many telegraphic systems have been used over the centuries, but the term is most oft…