The March 1931 issue of Television News[1] is a fantastic snapshot in time of the development of Television.

Amazing all those various silly spinning disk systems peppered throughout the magazine...and then buried on page 48 there's Philo T. Farnsworth[2] and his "scanning electric pencil"! Huzzah!

[1] https://worldradiohistory.com/Archive-Television-News/Televi...

[2] https://en.wikipedia.org/wiki/Philo_Farnsworth