Wow. He anticipates many future inventions. I suppose we can forgive him for not knowing about the transistor. He does talk about the possibility of using va

Wow. He anticipates many future inventions. I suppose we can forgive him for not knowing about the transistor. He does talk about the possibility of using vacuum tubes for switching the telephone network, among other things. Interestingly, he mentions the vacuum tube again when talking about unknown unknowns that might increase technological progress: "Technical difficulties of all sorts have been ignored, certainly, but also ignored are means as yet unknown which may come any day to accelerate technical progress as violently as did the advent of the thermionic tube..."