I had a magneto in the original oak box with a pair of "J" bells on the
box - very old 2-part signalling circuit from early telephone days. On top
of the box I mounted a pair of shiny brass screws. On the rear was a couple
push switches, not visible from the front. One switch connected the bells
to the magneto which would ring when the crank was turned and the other
switch connected the magneto to the pair of brass screws.

My "electricity demonstration" to the kiddies went like this: "Let's see if
you have enough electricity in your body to ring the bells". One kid (maybe
the shill) would grab the terminals and sure enough, when I cranked the
magneto, the bell would ring as I depressed the appropriate switch on the
back. "Now Johnny, you try it" Sure enough the bells would ring again.
We'd go like this until the loud mouth's turn came. "Oh, sorry Gizmo, you
don't seem to have enough juice to ring the bells. Whyn't you wet your
fingers to see if you can get a better connection".

Bob Swinney


"jim rozen" wrote in message
...
In article 7dEqd.4085$wa1.2802@lakeread04, Glenn Ashmore says...

I did an electricity generating demo for a 2nd grade class that kept their
attention. Took the secondary out of an old ignition coil and found a
rare
earth magnet that fit loosely inside. After doing the
wire/compass/magnet
thing I was starting to loose them so I "volunteered" the class loud mouth
to hold a couple of wires while I dropped the magnet through the coil.
That
kept them enthralled for another 10 minutes.

Heh. The same effect can be done with a telephone magneto, too.
A kid did that in 5th grade, he made a "lie detector" that way.

Jim


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