Re: [AGA-Member] undergravel heaters -- or - uncovering the costsandbenefits

["S. Hieber" <shieber@yahoo.com>]

Nikola Tesla used to win friends and influence people by
grabbing very high voltage electrodes. It was high
frequency AC and so the current ran over the outside of his
body, leaving him unharmed. He was countering Thomas
Edison's having invented the "electric chair" so that, with
the use of various animals, he could show folks at the
world's fair how deadly dangerous "Tesla's AC" was (Ol' Tom
had the rights to inventions for DC stuff and wanted the
country powered with DC).

Moral? -- What harm a thing can do you can depend on how
much it wags back and forth. 

Scott H.


--- Troy Hendrickson <t_hendrickson@qwest.net> wrote:
> Hee Hee
> 
> Actually it's an electrical testing lab where I work, as
> the story goes,
> this became a subject of debate before I worked there,
> and they supposedly
> put a goldfish in a sleeve testing tank, a stainless
> steel tank which is
> energized at 7,200VAC and the fish lived. The steel tank
> is hot, the path to
> ground are probes that reach into the water filled
> sleeve, the test measures
> the dielectric properties (current leakage) of the
> sleeve.
> 
> Considering some of the rather juvenile behavior I've
> seen there, I have no
> problems believing they did such a thing, don't know
> about the fish living.
> 
> A human of course would be truned into plasma, humans are
> grounded by the
> earth they walk on. The only way (in theory) a fish could
> get zapped is by
> touching a probe and completeing the path to ground.
> 
> The DNR here uses DC to stun fish for counts, it works
> because the fish are
> caught between the negative and positive electrodes, with
> AC since the fish
> isn't completing a path to ground just floating in the
> water, no zap. Any
> further explanation would be in the engineers domain and
> that's where i see
> their lips move, but all I hear are seagulls.
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "S. Hieber" <shieber@yahoo.com>
> To: "Aquatic Gardeners Association Member Chat"
> <aga-member@thekrib.com>
> Sent: Monday, March 07, 2005 11:29 AM
> Subject: Re: [AGA-Member] undergravel heaters -- or -
> uncovering the
> costsandbenefits
> 
> 
> > But just to be sure, see if you can't get him to drop
> his
> > hand into a bowl of water without his catching on. With
> > appropriate electrical hookups. ;-)
> >
> > sh
> > --- Troy Hendrickson <t_hendrickson@qwest.net> wrote:
> > > A DC system also has the potential to stun your fish
> > > under the right
> > > circumstances. AC as rule will not because fish
> aren't
> > > grounded, where as
> > > with DC, they can get caught in the field between the
> > > positve and negative.
> > >
> > > At least that how the EE at works likes to tell it,
> and
> > > since he has
> > > substantially more paper on his wall than I do, at
> the
> > > very least it isn't
> > > worth arguing with him about it.
> > >
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_Aquarium Plants_, Christel Kasselmann, will be speaking about plants and tanks at the NEC 30th Annual Convention

It's not too late to register. Get info at:

http://www.northeastcouncil.org/html/modules.php?op=modload&name=News&file=index
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