Television was not invented by a single person. It evolved over time from multiple inventors who improved upon each other's ideas. The origins of TV can be traced back to the 1830s and '40s with the telegraph and telephone, followed by the spinning discs of Paul Nipkow's electric telescope. The technology was improved upon by Boris Rosing and Alan Archibald Campbell-Swinton, who replaced the spinning discs with cathode ray tubes, and later by Vladimir Zworykin and John Baird. The first regular TV service was initiated by the National Broadcasting Company in 1939. RCA hired Zworykin to develop television technology for the company and was competing with Philo Farnsworth, who had his own ideas for television.
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