Kingdon S. Tyler - Telecasting and Color (1946)
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A book explaining color TV in what appears to be fairly nontechnical terms. ("Appears" because I've just skimmed this.) The image below is the only one in the book that's actually in color though there are plenty of others, including a water-cooled vacuum tube! Since much of the early part is devoted to TV in general there's frequent comparisons to how radio works - all of it mostly a vanished world now. At one point the author (who seems to have been an engineer for CBS) even states live variety shows will be more popular on TV than recorded shows.