Al Capone was known to remove noise with a similar technique.
<Response> Two winters ago I had some noise that only occured on very cold
nights. I suspected a bad power transformer atop a pole. The problem was
how to identify the pole it was on. I'd like to share the two tricks I
used. You'll need a baseball bat.
I went down the block listening with an AM radio. When the noise increased
I whacked each pole with the baseball bat. When I hit the 3rd pole the
noise immediately changed. The vibration caused the pole to vibrate which
transfered into the transformer. A crude microphone! I also noticed a "red
light" atop the transformer which I later learned was an "over-temp"
indicator. When I called the local power company they agreed to check it.
Two days later, no more noise! I received a call from one of their
engineers who was amazed to hear how I found it. He commented that they
had a $10K instrument for doing what I did with a baseball bat and an AM
radio!
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