I remember hearimng of a case where an old chimney was resonating like a pipe-organ with air currents.
and other cases where noise has originated from equipment at an industrial or military site.
Transformers and other power distribution equipment sometimes hum, including on ralilway lines.
and other cases where noise has originated from equipment at an industrial or military site.
Transformers and other power distribution equipment sometimes hum, including on ralilway lines.