[Farmall] Oliver Cletrac

[John McDevitt]

Thanks to everyone who responded to my question about battery polarity
on older 6 volt machines.  The topic has taken on new facets beyond my
needs, but the list is always a great resource. 

John


-----Original Message-----
From: farmall-bounces at lists.antique-tractor.com
[mailto:farmall-bounces at lists.antique-tractor.com] On Behalf Of
soffiler at myeastern.com
Sent: Friday, June 17, 2005 10:11 AM
To: Farmall/IHC mailing list
Subject: Re: [Farmall] Oliver Cletrac

From: Ferg8n9n at aol.com

> almost all 6 v is pos ground, rare exceptions.
>  
> Pos ground is better overall, but the invention of the
> transistor forced us   to switch.

Better overall?  Interesting statement.  I'd like to hear
some detail to back up that claim.

The transistor was "invented" (developed is a better word)
between 1947 and 1954, when the first commercial product, a
transistor radio, was produced by a collaboration of Texas
Instruments and Regency.  Indeed, it was this same period
that saw the switch from positive ground to negative ground;
however, there were no transistorized components being used
in vehicular electrical systems at this time so I don't see
the logic there.

Negative ground is considered "correct" from the standpoint
of chassis corrosion.  When positive and negative conductors
are immersed in a solution (humid air is a "solution") the
positive polarity loses metallic ions which gather on the
negative side.  This is also how electroplating works.  So
you don't want your chassis positive, it'll slowly
disappear.


Steve O.
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