"Scott Dorsey" wrote in message
...
Bill M wrote:
Geoffrey S. Mendelson wrote:
Scott Dorsey wrote:
If you go onto an American military base in Germany
today, you'll still
see Edison outlets at 110V. Americans have always
carried our power with
us wherever we have gone.

But in the summer of 1944, you would not have found any
(110 volt
power or US bases) in Europe. The whole point of the
unit was to be
a portable radio station, not something you had to build
a base around.

I thought France was still on 110 in those days. I've
restored some
French sets both pre and post war, some I think were 110
only.

France was spotty, with some places being 110 and other
places being 220
and a few places having weird line frequencies too. This
led to a legacy
of lots of weird incompatible light bulb bases too, which
the EU is only
finally getting cleaned up.

Remember, this was an era when there were no large scale
power grids,
and individual cities had their own generating plant and
their own
standards. Well, Germany started to have a grid, but we
took it out....
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

FWIW, the third edition of _Reference Data for Radio
Engineers_ dated 1949 shows France has having DC power at
110, 120, 125, 220 volts and AC at 110, 115, 120, 125, 220,
230 volts and both 50hz and 25hz. It indicates that the
predominant power was 110 or 115 VAC at 50hz.
A this time power frequencies of 25hz, 40hz, 42hz, 43hz,
45hz, 100hz (Malta) could be found in various parts of the
world.
50hz has always been the most common power frequency in
Europe and 60Hz in the USA and Canada. 25hz is used for
industrial purposes, particularly for electric railways
because core losses are lower in motors and transformers
(less heat dissipated). I have no idea of the origin of the
40hz series. Power voltages and frequencies in "third world"
countries usually follows the preferences of the countries
that colonized them.
In the Los Angeles area until about the mid 1950's one
could find both 50hz and 60hz power. The city, which is
supplied by the publicly owned Department of Water and Power
was 60Hz, the outlying areas not incorporated into the city
mostly got their power from Southern California Edision
which was mostly 50Hz. I remember seeing hydro-electric
generators at the old St. Francis power station that were
originally 50Hz but were run overspeed to generate 60hz.
These survived the St. Francis dam collapse and subsequent
flood.


--

--
Richard Knoppow
Los Angeles
WB6KBL

"Richard Knoppow" wrote in message
...

25hz is used for
industrial purposes, particularly for electric railways
because core losses are lower in motors and transformers
(less heat dissipated).


Richard,

I believe the real reason for 25 Hz power near Niagara Falls was the
large number of chlor-alkali plants in the area. The Castner
Electrolytic Alkali Company began operation at Niagara Falls in
1897. Eventually this became the Olin Niachlor plant. Chlor-alkali
plants are a major consumer of electricity, and it was plentiful and
cheap at Niagara Falls. Other companies in the same area with
chlor-alkali plants are DuPont and Hooker (later to be Occidental
Chemical).

The reason for using 25 Hz AC is related to the need for high
current DC for use in the process. In the early days, mechanical
(rotary) rectifiers were used to convert the AC to DC. Essentially
a synchronous motor was used to turn large disks broken into
sections. AC was fed to these disks. Brushes would rub on the disk
producing a unipolar output. Operating at 1500 RPM this system was
quite efficient. But at 50 or 60 Hz, rotating the disks at 3000 or
3600 RPM, the efficiency was less (the off time, essentially the
insulating space between the disk sections, became a larger portion
of the total period) and the brushes wore out faster. Operating at
lower frequencies would have been even more efficient but
transformer size became excessive.

Unfortunately the early electrolytic cells used mercury for one
electrode leading to a major pollution problem. You might recognize
the name Hooker Chemical from their waste being dumped in the Love
Canal.

73, Dr. Barry L. Ornitz WA4VZQ

On Wed, 8 Apr 2009 09:39:03 +0100, "Roger Basford" Roger at new-gate
dot co dot uk wrote:


"Jon Teske" wrote in message
.. .

I'm going a vague memory here, but one of the fellows did look like
Bill Halligan who 10 years later was often pictured in Hallicrafter's
ads. I remember he had a two letter suffix in his call and for some
reason I thought it was W9AN.

See www.geocities.com/w8jyz/W9AC.pdf

Thanks Roger for that link. I wonder how he pulled off that two letter
call suffix having had a three letter one before. That must have been
quite rare or perhaps some sort of "reward" for his WW II engineering
service. I have no idea how that worked in those days. By the time I
got into radio (1956 as a teen) two letter suffixes were VERY rare in
the US until they became available as a sort of reward for having the
Extra Class and a certain amount of longevity. Later they became
available as a "vanity" program in conjuction with holding certain
classes of license. 1X2 calls don't seem to become available very
often now.

Allowing for changes in eyeglasses and a bit of aging, it does appear
that the fellow pictured in your link is the same guy I think was
Halligan in the movie. I knew one fellow who had worked with him
during the war and he said that Bill Halligan was a real gentleman and
a brilliant engineer.

Jon Teske, W3JT

On Wed, 8 Apr 2009 21:26:07 -0400, "Phred" wrote:

"Richard Knoppow" wrote in message
...

25hz is used for
industrial purposes, particularly for electric railways
because core losses are lower in motors and transformers
(less heat dissipated).


Richard,

I believe the real reason for 25 Hz power near Niagara Falls was the
large number of chlor-alkali plants in the area. The Castner
Electrolytic Alkali Company began operation at Niagara Falls in
1897. Eventually this became the Olin Niachlor plant. Chlor-alkali
plants are a major consumer of electricity, and it was plentiful and
cheap at Niagara Falls. Other companies in the same area with
chlor-alkali plants are DuPont and Hooker (later to be Occidental
Chemical).

The reason for using 25 Hz AC is related to the need for high
current DC for use in the process. In the early days, mechanical
(rotary) rectifiers were used to convert the AC to DC. Essentially
a synchronous motor was used to turn large disks broken into
sections. AC was fed to these disks. Brushes would rub on the disk
producing a unipolar output. Operating at 1500 RPM this system was
quite efficient. But at 50 or 60 Hz, rotating the disks at 3000 or
3600 RPM, the efficiency was less (the off time, essentially the
insulating space between the disk sections, became a larger portion
of the total period) and the brushes wore out faster. Operating at
lower frequencies would have been even more efficient but
transformer size became excessive.

Unfortunately the early electrolytic cells used mercury for one
electrode leading to a major pollution problem. You might recognize
the name Hooker Chemical from their waste being dumped in the Love
Canal.

73, Dr. Barry L. Ornitz WA4VZQ


I vaguely remember my father (an electrician) telling me that power at
the very beginning of WW II in the Gary Indiana area was 25 Hz.

Does anyone know anything about that? Would the presence of steel
mills and other heavy industry have anything to do with it.

I have no reason to doubt what my father had said (but I can't ask
him anymore.)

Were there other places in the US that had non standard Hz. Also I'd
be interested in knowing when 60 Hz became the US standard and why?

The Gary, Hammond, East Chicago area and Southern parts of nearby
Chicago is, of course, one of the more heavily industrialized areas in
the US, or at least it was in the first half of the 20th century. Gary
(which happens to be my birthplace though I only lived there 10 weeks,
at the beginning of WW II) was founded specifically as a "Company
Town" in 1906 for US Steel and is named for an early president of the
company.


Jon Teske, W3JT [And as I found out on the only visit I ever made to
Gary aside from bypassing it on the tollways when I stopped to get an
Indiana Birth Certificate, my claim to fame is that I was born in the
same hospital as the Jackson family kids...Michael, Janet, Tito etc.

Sheesh! ]

Anybody notice any audio-video sync problems in the MP4
version? I tried two different players and the track was
way off.

I'm going to download the MPeg2 version and see how that plays...

Jim





On Sat, 4 Apr 2009 18:30:48 -0700, "Richard Knoppow"
wrote:

I found a tour of the Hallicrafter's plant on line.
This is a WW-2 propaganda film, dated 1944 and titled "Voice
of Victory". In two parts at http://www.archive.org
It has considerable detail on the construction of the
BC-610 and shows some other products in somewhat less
detail.

"Jim" wrote in message
...
Anybody notice any audio-video sync problems in the MP4
version? I tried two different players and the track was
way off.

So is my Verizon Fiber TV box running my NTSC TV.

Paul P.

Jim wrote:
Anybody notice any audio-video sync problems in the MP4
version? I tried two different players and the track was
way off.

How can you tell? From what I remembered and a quick review, the only
place there could be synchronized sound is at the begining with the
ham who was later identifed as the chief engineer of Halicrafters
(Samuelson) "on the air" and the speech at the end of the second part
by the head of the Signal Corps.

They were both fine with my playing them using QuickTime player and VLC
under MacOS.

Geoff.

--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM

http://library.duke.edu/digitalcolle...R0111-lrg.jpeg


Looks like their letterhead circa 1945.

Geoff.
--
Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM

"Geoffrey S. Mendelson" wrote in message
...
http://library.duke.edu/digitalcolle...R0111-lrg.jpeg


Looks like their letterhead circa 1945.

Geoff.
--
Geoffrey S. Mendelson, Jerusalem, Israel
N3OWJ/4X1GM

Sure does look like a letterhead although letterheads
usually also have phone numbers and cable addresses on them.
There is a copyright notice below the word "radio"
indicating 1945 and the pictures feature the mobile radio
station from the movie (forgot the SCR number) with an E for
Efficiency banner, also the SX-28, probably the best known H
product of the time.
I wonder what the original source was.

--
Richard Knoppow
Los Angeles
WB6KBL