Figure 1
Radio meets radio criticism. Mandy Treptow illustration, 2019.
Figure 2
Early valve radio set. Source: Thomas Ford Memorial Library.
Figure 3
Call sign of 2LO the BBC’s first broadcasting station (audio). Source: radiorewind.co.uk
Figure 4
Example of an old radio dial, showcasing the scope of the international radio landscape. Undated. Source: Pedro Moura Pinheiro (Flickr).
Figure 5
Tube TV-set of the late 1950s. Source: W. Trusz and J. Dombrowicki, Radio i telewizja w domu (Warsaw: Wydawnictwo Komunikacyjne, 1958).