"John Rowland" wrote in message
...

I've noticed that a lot, or all, London double deck buses have a device on
the end of the rear right axle which keeps approximately upright as the
wheel turns. What is it?
Wheel Revolution counter?

See http://www.patentstorm.us/patents/50...scription.html

Reminds me of:
http://www.kididdles.com/lyrics/b014.html

Regards

David Bennetts
Australia