It appears to me the problem is not how to lock the door but how to keep the
visitor out!  Harry has a great idea however,

Radio shack sells a small 4" x 2" approx. alarm when the beam is broken a
great ear spllitting alarm will sound, or if this is too
much a "ding dong" alarm will sound., personally I use the ear splitter.
they cost between $10&15 dollars and use 2 AA batteries .  They are great of
any number of uses  where you might want to be made aware of any breach of
security.
[log in to unmask]
On Tue, Oct 13, 2009 at 4:34 PM, Harry Heiss <[log in to unmask]>wrote:

>
> Personally, I like inter-active museum exhibits.
>
> So if it were me, I'd connect the driver's side door handle to the car's
> battery.
>
> Harry
>
>
>
> "Be nice to the archivist, or he'll erase you from history."
>      --Anonymous
>
>
>
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