Re: Weather warning!

In a recent message
Chris Evans <chris@xxxxxxxxxxxxxxx> wrote:

> In article <6bfd5c8a4d%beamendsltd@xxxxxxxxxxxxx>, beamendsltd
> <URL:mailto:beamendsltd@xxxxxxxxxxxxx> wrote:
>
[....]
> > Mind you, as quite a lot of Mercedes owners found out a few years back,
> > designing out the possibility doesn't always work..........
>
> The ban at petrol filling stations is due to the *theoretical possibility*
> of problems. IIRC a recent study couldn't find anywhere in europe any
> actual incidents due to mobile phone use at a filling stations.
>
The theoretical possibility is of a tuned circuit with a gap resonating
and producing a spark when there is a tranmission. This circuit could
be a part of the vehicle structure. I don't expect anyone (even RISC OS
users) can remember the first experiments with wireless communication
that relied on this effect; we should, at least, know the history. The
spark could then ignite the petrol vapour, lead free fuels have a lower
flash point than older fuels. Vapour recovery systems are not only
concerned with the health risks of inhalation, inmmolation is also
considered to dangerous (quite apart from disrupting sales) ;-)

--
Dave
.