Editing Thomas Edison (section)

===Telegraph improvements===

The key to Edison's initial reputation and success was his work in the field of telegraphy. With knowledge gained from years of working as a telegraph operator, he learned the basics of electricity. This, together with his studies in chemistry at the [[Cooper Union]], allowed him to make his early fortune with the [[ticker tape|stock ticker]], the first electricity-based broadcast system.<ref name="Thomas A. Edison: A Streak of Luck"/><ref name="faculty.cooper.edu"/> His innovations also included the development of the quadruplex, the first system which could simultaneously transmit four messages through a single wire.<ref>{{cite web |last1=Josephson |first1=Matthew |title=Thomas Edison: American Inventor |url=https://www.britannica.com/biography/Thomas-Edison |website=Britannica |access-date=March 10, 2021 |archive-date=February 13, 2021 |archive-url=https://web.archive.org/web/20210213021318/https://www.britannica.com/biography/Thomas-Edison |url-status=live }}</ref>