Howard Winter wrote:
> Right, but as I said to Herbert, these aren't fail-safe - you have to buy them and insert them in all empty 
> sockets.  Murphy says that the one you forget is the one where the problem happens!  :-)

Absolutely true.

> Since it's built-in to the sockets, it's not easy to see the mechanism.  I'll see if I can find a useful 
> picture...

Ah, I get it!  Clever and simple.

Now, why we don't do something similar I couldn't say, other than that 
it may have to do with Newton's First Law...
-- 
Timothy J. Weber
http://timothyweber.org
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