Posted by jdemaris on January 26, 2010 at 10:06:58 from (67.142.130.12):
In Reply to: Positive Ground posted by mss3020 on January 26, 2010 at 07:08:34:
The choice of using one polarity or the other depended much on what theories engineers had the most faith in. The Electron Theory or the Hole Theory. Both are just that, still theories and never been proven.
Positive ground is still used in certain applications, but not in the main-stream consumer market. More in marine and military applications.
Years back, some autos used ignition systems that used BOTH polarites. They used "polarity changers" to alternatre between neg and pos ground. That was an early effort to preserve ignition points life.
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