PrettyboyTim said:
[citation needed]
A lunchtime 'prat about' at the Motor Industry Research Association proved this to be true.
A frequency analyser was used to record my bike wheels as I rode past.
The reason for this was such:-
On my commute, there was a dog at a farm who ALWAYS chased to the gate and barked. It didn't matter if the hound was lying facing the oposite way, it would jump up and run to the gate.
The frequecies were similar to those given off by 'dog whistles' from the local pet store, one of which I bought to compare.
There are other dogs at houses I regularly pass who bark furiously.