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dpb

On 08/19/2014 5:13 PM, wrote:
....

I saw a demonstration - and cannot figure out why :
: it works on a finger
: it works on a hot dog - being held by a finger
.. but not on a hot dog that is not held by a finger !

....

The demo's w/ the hotdog I've seen had it on a stick swinging into the
blade...altho thinking about it, perhaps it was a metal rod so there was
still a sizable object of capacitance in effect in contact...

As the mechanical design article says, it's on the capacitance-matching;
similar in principle to the capacitance-sensing lamp switching.

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