| To: | "lherault" <lherault@bu.edu> |
|---|---|
| Subject: | Re: Pos eart and tools |
| From: | "Brian Ricker" <bricker@connectria.com> |
| Date: | Wed, 14 Jul 1999 15:47:47 -0500charset="iso-8859-1" |
| Cc: | <triumphs@autox.team.net> |
| References: | <001601becefd$e8a185e0$0bd4299b@dent-bio.bu.edu> |
> I'm guessing Pos. earth had something to do with electrical practice current > (no pun intended) when automobiles were being developed. I wonder if > telegraphs were set up with positive earth? You may be on to something here, battery voltage on telephones (the non-ringing current) in North America is 48V DC positive ground. The ringing portion is ~90V AC superimposed on this. |
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