It's about the time when we were starting to understand you could bounce radio waves round the world and broadcast TV. So it was quite common around those days. It's one of the things I love about books from this era. Being the beginning of so many new technologies that were about to change the world, like communications, transportation, oil, electricity, aviation to name a few. The writers tried to see what the end game would be. We all remember the flying cars and things that have yet to come but overlook all the things they got right. Like the story of the teleporter in Star Trek (cheap special effect so did not have to film shuttles going through space), instant visual communication is often a useful plot tool as you don't have to work out how people move around. Your giving me the bug. May have to stick my noise into one of my books again this weekend.