In article ,
Harry Bloomfield wrote:
Dave Plowman (News) brought next idea :
So you start out with a speedo dead accurate with new tyres. Then the
maximum error would be 2%. Not 10% as allowed. Things have moved on since
that reg was written.

It was written with in mind a cable drive from the back of gearbox and
an instrument which used a cable driven magnet and a clock-spring.
Rather than the precise electronics we can make so easily these days..

Quite. Although even eddy current speedos could be far more accurate than
that spec.

Then there were chronometric ones. You'd laugh at a clock which couldn't
better 10% accuracy even in the 19th century.

--
*Can fat people go skinny-dipping?

Dave Plowman London SW
To e-mail, change noise into sound.