TELECOM Digest OnLine - Sorted: Re: 25 Hz Power

Re: 25 Hz Power

Herb Stein (
Sun, 12 Mar 2006 05:14:18 GMT

Herb Stein <> wrote in message

> (Thomas D. Horne) "Electrician" <> wrote in message

>> Boston Edison used to provide 600 volt DC service for the operation of
>> elevators and cranes. I don't know if they still do.

> I know Milwaukee, WI had DC available at some point in the distant past. I
> used to have a water cooler with a DC motor from downtown somewhere.

> Upper Michigan had 25Hz (cycles/second at the time) at a number of
> copper mining operations, if memory serves.

>> Tom Horne

>> "This alternating current stuff is just a fad. It is much too dangerous
>> for general use." Thomas Alva Edison

> Herb Stein

> [TELECOM Digest Editor's Note: A water cooler with a DC motor is
> interesting; but did you ever see a _refrigerator_ powered by -gas-
> rather than -electricity-? I had one of those in a long since for-
> gotten apartment in Chicago back in the 1960's. No motor of course, no
> compressor, etc, but it was a refrigerator, freezer, etc, and I think
> (cannot remember for sure) it was manufactured by 'Frigidaire
> Company'. Totally silent of course. I have no idea how it worked; if
> I ever knew, I have since forgotten. PAT]

I'll have to make a phone call, but I think a friend of mines girl
friend has a gas air conditioner at her house in Farmington MO. I'll
have to get back to you on that one.

Herb Stein

[TELECOM Digest Editor's Note: I have also seen 'air conditioners'
which have a position on the switch to put out heat (as well as
the usual two or three cool air positions.) PAT]

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