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On a science forum, and no one asked the strength!
..... bottle filled with acetic acid .....
I would no more put acetic acid on my chips
Presumably he diluted it before use. Vinegar is usually about 5% acidity.
try a spring mounted on the helmet with a shiny/reflective ping-pong ball atop the spring?
POINT IS MAGPIES ARE ATTRACTED to bright shiny objects 
Quote from: Geezer on 22/11/2011 20:45:02POINT IS MAGPIES ARE ATTRACTED to bright shiny objects so lengthen the spring & magpie attacks the shiny ball & avoids the driver?