D:20th Century
L:Silverstone, Northhampshire
S:Joan Forman
In her book, The Mask of Time, Joan Forman relates the story of an electrician who worked during the day in a Nissan hut on an old RAF airfield near Silverstone motor racing circuit. He recieved complaints from a couple living nearby that they could not sleep because of the noise of his working during the night. The electrician did not work at night and he knew that he was not responsible, but he assumed, reasonably, that someone was using his work place and tools for unauthorised purposes when he was not there.
To catch them out, he left a tape recorder recording overnight in the building but when he played it back he found that it was still blank. On an impulse he sent the tape to a specialist and it was found that if the tape was played back at a different frequency all the sounds of a workshop-exactly those complained by the couple near by-could be heard