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[part 2] Aquatic Plants Digest V2 #58

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 * Continuation 1 of a split message *


  Now, if you go for the solenoid, there's more to the story, but I haven't
figured that part of the story out completely so you'll have to wait
for the paperback, as it were :-]

  And by the way, Gary Bishop mentioned to me that there exist such things
as "air-gap" Ph probes and "Amplified" Ph probes.  Does anybody know where
stuff like this can be found or more about what it is about?

                                        - Steve
- ------
Steve Benz (steveb at realtime_net)   |   Pragma Systems, Inc.
Author of ZipPiz, a Windows utility for unpacking downloaded archives.
http://www.ccsi.com/~pragma/zippiz.html | ftp://ftp.ccsi.com/pub/pragma


------------------------------

From: Stephen.Pushak at saudan_HAC.COM
Date: Wed, 08 May 1996 10:58:14 PDT
Subject: Re: Ph probe problem

> From: Andrew Hamilton <andrewha at tafe_sa.edu.au>
> 
> My current thoughts on
> rectifying the problem is to section the probe of under the hood from the
> lights by using a wall made from plumbers lead. Does this sound feasible? Is
> it necassary to earth the lead? Will the magnetic field pass through the
> glass lids and into the water, therefore going around the lead barrier? Is
> there some way of making something along the lines of an earth leakage
> circuit to drainthe magnetic field? 

The problem is induced voltage caused by an electric field not a static
magnetic field. You can use aluminum foil as an effective shield. Yes,
I believe it should be grounded (connected to earth). Water is a conductor
and if connected to the ground circuit, it will also act as a shield
(although much less effective than metal). I won't go further into
electro-magnetic effects and theory since my attempts to clarify the
difference between electric and magnetic fields may only confuse and I
am not a physicist. ;-)

Steve

------------------------------

From: John Kuo <johnk at jandel_com>
Date: Wed, 8 May 1996 14:53:18 -0400
Subject: Developing aquarium hobbyist software

I am part of a team of software designers looking to put 
together a truly professional program targeted for both
beginning and advanced aquarists.  It will run on both
the Mac and PC.  What I would like to know from
you are the features you'd like to see in this program.
If you want to avoid clogging up this site, please feel free
to respond directly to me.  Thanks.

------------------------------

From: John Lobingier <jlob at wpa_net>
Date: Wed, 8 May 1996 19:24:40 GMT
Subject: Halogen Torchier Lamp For Plants?

I was talking to a person on the net and they told me that they use a
halogen torchier lamp with adjustable brightness to light their tank.  They
dismantled the lamp they bought, and then hung like a pendant light.  I
thought it may be a very good idea.  Is it?  Is halogen a effective light
for plants?  It would be very bright!  A possible cheap substitute for metal
haldide?   

John


------------------------------

End of Aquatic Plants Digest V2 #58
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