A small mystery? An engraved, antique brass plate, English in origin, vibrating furiously on a wall? Why?
This happened a couple of years ago, and I still wonder what caused it. I heard a strange hum throughout my house, and finally tracked it to a downstairs bathroom where an engraved antique brass plate hung on a wall beside a window. The plate was virbrating furiously as it hung on the wall, but nothing else in my house was doing this. Why the plate, and what caused it? Finally, I gently touched the plate with a finger and the vibration immediately ceased. The plate is round, solid brass, about 2/3 the size of a dinner plate and came from London when a relative brought it back from a visit to an antique shop. Is the plate haunted, or is there a reasonable scientific explanation for this phenomenon?
I think that its size and shape just happened to give it the right resonating frequency, allowing it to be responsive to an ultrasonic phenomenon (which you couldn't hear).
"Ultrasounds" can be caused by a variety of factors -- vehicles passing by, the shape and location of the room, seismic factors, and so on. It just happened to be in the right location where it was able to respond to the disturbances. (Incidentally, areas subject to high levels of ultrasonic phenomena are often associated with hauntings and the like.)
BTW, there's an outside chance that you had a little bit of a magnetic disturbance in your basement caused by the ground shifting under your home, but I think the first possibility is most likely.
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