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In the early years of the last century, R.A. Millikan measured the charge of the electron. He was one of the greatest experimentalists to ever live, not only isolating and measuring something so incredibly small but doing other important work with things like cosmic rays. As such, when I saw he had a book, named The Electron, I figured he ought to know a thing or two about the subject. He did; it’s a complete, informative, and up-to-date book, so long as that date occurs within World War I.
The book has been eye-opening, not because of the new physics, but because of all the outmoded and discarded theories that he mentions and dismisses on the way. What if electrons didn’t have a fixed charge, but a statistical distribution that averaged out to what we think of as a fixed charge? This was a viable theory until Millikan disproved it looking at his oil droplets. What really got me though was when he spent his last chapter describing wave-particle duality. Only there was no such thing when he wrote the book. At that point all modern physics had was a real head-scratcher of a problem. Sample quote: