“Pictures by wireless” was theorized in the early 1900’s, but it took until the 1920s before Charles Jenkins invented a mechanical scanning disk television. 

With the invention of all-electronic television by Philo Farnsworth in 1927, television was on the path to its incredible success story.  Having purchased Farnsworth patents, RCA commercialized all-electronic television publicly demonstrating TV at the 1939 World’s Fair in New York.

Scanning TV was used in commercial television broadcasting from 1925 to 1939 when all-electronic television rendered scanning television obsolete.  “And the rest of the story is….”