I then asked them to go out and check how stable the Freyas were, because I suspected that the high stability that we had observed was merely another example of German thoroughness and precision, even where it was not required. A fortnight later the experts came back and told me that I was right: the stability of every German radar station was better than that of the best instruments that we had available to check them. In fact, Martin Ryle, afterwards to win a Nobel Prize for Radioastronomy, was one of our observers, and he told me that ever afterwards if he wanted to know whether a radar
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