Author Topic: Central Office Names  (Read 8952 times)

Offline xhausted110

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Re: Central Office Names
« Reply #30 on: April 20, 2016, 02:46:28 PM »
Back on the subject of exchange names, here's an advertisement card from Chicago for a phone booth. Interesting that the police and fire departments had their own exchanges. Also note that this is from before DDD or TSPS, "long distance- 211"
- Evan

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unbeldi

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Re: Central Office Names
« Reply #31 on: May 07, 2016, 12:15:26 PM »
I believe the following came from a cover of a Chicago telephone phone book, I don't have the original source.

1959 Chicago's Exchange Names



Offline jsowers

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Re: Central Office Names
« Reply #32 on: May 07, 2016, 03:07:02 PM »
Notice how they're called "exchange names" and not central office names.

Chicago had some unique ones like New York City. The list is very nice to see. I don't think I had ever heard of INterocean 8 before. I remember HAymarket 1 from the cover of the 1956 Allied Electronics Catalog I have.

They devoted one name for fire and another for police, in those days before 911, and 1313 were the last four digits for both. I wonder how they came up with that, and not 1111 or 1212 or 2368?
Jonathan

unbeldi

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Re: Central Office Names
« Reply #33 on: May 07, 2016, 06:41:00 PM »
I thought that would tickle a bone,  :o
Yes, Chicago seems to not have followed the directives from the Central Office at West Street or Broadway, NYC, or thereabouts.

I also have another list of the Chicago exchanges from another telephone book and that page is also entitled with the term 'exchange'.

Starting with the design documents of the North American Numbering Plan in the mid 1940s, the official documents adopted the term 'central office' pretty consistently.  Out in the 'territories' this was not always so.

Interestingly, I recall reading some article that explained that the first telephone exchange in Chicago in ca. 1880, was called the Central Office.  When the next two exchanges opened they were referred to as Branches. Within a short time due to rapid growth, they were soon all simply numbered.




« Last Edit: May 07, 2016, 06:44:28 PM by unbeldi »

Offline Mr. Bones

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Re: Central Office Names
« Reply #34 on: May 07, 2016, 07:23:31 PM »
I also have another list of the Chicago exchanges from another telephone book and that page is also entitled with the term 'exchange'.

I think that we would all love to see that, if you'd be so kind as to share a scan, photo, usw. 8)

Many thanks, in advance, Karl!

Best regards!
Sláinte!
   Mr. Bones
      Rubricollis Ferus

unbeldi

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Re: Central Office Names
« Reply #35 on: May 07, 2016, 07:51:11 PM »
I think that we would all love to see that, if you'd be so kind as to share a scan, photo, usw. 8)

Many thanks, in advance, Karl!

Best regards!


Here it is.  The quality is rather poor.  But with some effort it can be useful too.
It is quite possible that this page came out of the same phone book, but I don't know.  Certainly it is approximately the same time frame.

I also found the article I was referring to earlier:
William D. Caughlin, Evolution of Local Telephone Numbers in Chicago,  2004-02-27
« Last Edit: May 14, 2016, 12:20:44 PM by unbeldi »

unbeldi

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Re: Central Office Names
« Reply #36 on: May 07, 2016, 08:25:16 PM »
I have a 1942 telephone directory from nearby Naperville, just west of Chicago, and the directory uses the term 'central office'.  It was issued by Ill.Bell.Tel.Co.

It appears that Naperville had a manual system at the time.  All numbers are simply prefixed with the name Naperville, and many carry party line suffix letters.

From the page 'Regulations':

Telephone Numbers.—The subscriber has no property
right in the telephone number or any right to continuance
of service through any particular central office.
The Telephone Company may change the telephone
number or the central office designation, or both, of
a subscriber whenever it deems it desirable in the
conduct of its business so to do.
« Last Edit: May 07, 2016, 08:28:11 PM by unbeldi »