Our remaining defect probably lay in the simple operation of picking up the German beams on a receiver, noting the dial reading and converting this to a frequency, and then setting a jammer on this same frequency. Put simply, British instruments were not as precise as they were supposed to be—and many people may have died as a result. I myself had been interested in many aspects of precision before the war, from straightening the ranks at Trooping the Colour to making accurate measurements in science: but even if I had had no previous inclination in that direction, the experience of Coventry
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