[SML] A use for half charged batteries.

[dale]

All the sound guys have a problem.  At the end of the gig, there is a box full of partially used batteries from all the wireless gadgets.  Here is a fine use for them.  
Dale


Sent from my Verizon 4G LTE smartphone

-------- Original message --------
From: Michael Leuchtenburg <michael at slashhome.org> 
Date: 12/28/16  09:28  (GMT-05:00) 
To: Techno-Fandom <tf at techno-fandom.org> 
Subject: Re: [tf at techno-fandom.org] 1000A: don't try this at home 

On Wed, Dec 28, 2016 at 9:12 AM, John Maizels <jmaizels at optusnet.com.au> wrote:
>   * the world's simplest electric train, using circuits that aren't even
> complete.  Seriously, this reminds me of the Dean Drive, and I'd dismiss it
> completely except for this rather compelling video which appears to have no
> Penn and Teller:  https://www.youtube.com/watch?v=J9b0J29OzAU

Ah, but they are complete! Many separate versions of the
magnet-battery-magnet-coil system are formed as it moves through the
long coil. In each case, current flows through the magnets, through
the coil, and back to the other end of the battery. Here's a motor
using the same design principle:
https://www.youtube.com/watch?v=94RpbYopUdI

Note that no change of polarity is required. That's because it's a
homopolar motor. Unlike commutated motors, the axis of rotation is
parallel to the magnetic field.

- Lucky
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