Desire- Posted November 28, 2023 Posted November 28, 2023 It is not only in Omagh that a hum is to be heard (‘It’s a bit of a mystery’: what’s causing Omagh’s hum?, 21 November). In Derby, I have been aware of a low-frequency hum for some years. It is much more noticeable at night and in winter, but only disturbing when lying in bed – probably because it could be a ground-transmitted vibration, which at its worst is on the boundary between hearing and feeling on the eardrum. It used to be a distinctive two-tone sound, like a mechanism changing between in gear and neutral, but this has changed over the last couple of years to a single deep humming tone. Its wave form seems in some locations to hit a resonant frequency with the room, which may be why the hum is more evident in some homes than others. I find it to be just below the threshold of preventing sleep, but it may be worse for anyone with a tendency to insomnia. Paul Birchall Derby Read Madame Bovary to solve the hum mystery – it’s a retired customs official endlessly turning napkin rings on his lathe. Keith Barnes Frome, Somerset https://www.theguardian.com/lifeandstyle/2023/nov/27/mysterious-hums-that-keep-us-awake
Premium
Recommended Posts