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27 Years of the Digest ... founded August 21, 1981

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Volume 28 : Issue 75 : "text" Format

Messages in this Issue:
  Re: under-sea power transmission cables 
  Re: under-sea power transmission cables 
  Western Union public fax services, 1960 

====== 27 years of TELECOM Digest -- Founded August 21, 1981 ====== Telecom and VOIP (Voice over Internet Protocol) Digest for the Internet. All contents here are copyrighted by Patrick Townson and the individual writers/correspondents. Articles may be used in other journals or newsgroups, provided the writer's name and the Digest are included in the fair use quote. By using -any name or email address- included herein for -any- reason other than responding to an article herein, you agree to pay a hundred dollars to the recipients of the email. =========================== Addresses herein are not to be added to any mailing list, nor to be sold or given away without explicit written consent. Chain letters, viruses, porn, spam, and miscellaneous junk are definitely unwelcome. We must fight spam for the same reason we fight crime: not because we are naive enough to believe that we will ever stamp it out, but because we do not want the kind of world that results when no one stands against crime. Geoffrey Welsh =========================== See the bottom of this issue for subscription and archive details and the name of our lawyer, and other stuff of interest. ---------------------------------------------------------------------- Date: Mon, 16 Mar 2009 18:13:57 +1100 From: David Clayton <> To: Subject: Re: under-sea power transmission cables Message-ID: <> On Sun, 15 Mar 2009 12:12:14 -0400, David Kaye wrote: > On Mar 12, 10:07 am, Will Roberts <> wrote: >> Following up on the discussion of underground high-voltage power >> transmission lines, it's worth noting a project which was under >> consideration in Hawaii. > > I'm wondering how safe it is to transport high voltages through bodies of > water. I realize it happens in the Bay Area (the cable that replaced the > Hunters Point power plant, for instance), but does anybody know how safe > this practice is? > > I know that rats are drawn to electric cables, which is apparently why > there are so many electrocuted rats who have eaten through cables. I'm > wondering if there is any other danger from running high voltages through > water. > The DC cable between Victoria and Tasmania was originally going to use the sea as the "return" conductor, but there were oil rigs in the vicinity and they kicked up a (justified) fuss about electrolysis corroding the rig structures, so the line ended up being dual conductor with both insulated from the environment (AFAIK). I'm assuming all these long cable runs are now DC to maximise the overall power that you can pipe down these things - all built on the back of super-efficient AC to DC conversions at either end. That might keep "bitey" things away from the cable rather than an AC field. -- Regards, David. David Clayton Melbourne, Victoria, Australia. Knowledge is a measure of how many answers you have, intelligence is a measure of how many questions you have. ------------------------------ Date: Mon, 16 Mar 2009 07:35:21 -0700 From: AES <> To: Subject: Re: under-sea power transmission cables Message-ID: <> In article <>, Eric Tappert <> wrote: > > With that adaptation, the major problem with undersea communications > cables these days is fishing trawlers snagging the cable. > Or, newer fiber optics cables and technologies coming along which have so much more capacity that it no longer makes sense to continue using the only slightly older versions, and they're simply abandoned in place on the ocean floor, long before the end of their useful life (or are converted into serving undersea observatories). (At least it's my understanding that this has happened with at least some transoceanic cables.) ------------------------------ Date: Mon, 16 Mar 2009 19:42:57 -0700 (PDT) From: To: Subject: Western Union public fax services, 1960 Message-ID: <> Per our recent discussion on Western Union services, I found some information about Western Union's public facsimile services. Western Union ran several advertisments in the New York Times for its public "wirefax"/"telefax" service. I found ads for 1959-1962. The maximum size of a document was 8.5" x 11", and the transmitted portion was roughly 1" shorter on all sides (7.5" x 10"). Transmission took five minutes. The service was offered in New York City, Washington DC, Chicago, Los Angeles, and San Francisco. In the time span I checked no additional cities were added. The material had to be taken to a Western Union office. WU would pick it up at an additional charge for their messenger. It would be delivered by Western Union messenger without charge to any place within the city limits of the destination city. The first 4" vertically between NYC and Chicago cost $2.40 and 40 cents for each additional inch. plus Federal tax. The first 4" between NYC and San Francisco cost $4.00 and 65 cents for each additional inch plus Federal Tax. So, a full page letter (with margins) to Chicago would cost about $3.60 per page, to San Francisco would cost about $5.95 per page, both plus Federal Tax (10%?), in 1960 dollars, plus the expense of delivery to the central WU office. By today's dollars that seems quite pricey. An engineering drawing would probably be larger than regular office size and need to be cut up for transmission in multiple pages. Legal contracts are usually multiple pages. Thus, a typical business document would be very expensive to transmit. Given that high price I can't help but wonder if a business might be willing to wait a day or two for air mail and special delivery, at a fraction of the cost. Other alternatives might be a Night Letter telegram or a Telex/TWX message. The business world moved a bit slower in those days*. I presume there was some sort of air express service by 1960, but I have no idea what they'd charge for a small package back then. I believe Railway Express Agency (REA) offered expedited shipping on the fast overnight trains between New York and Chicago (eg the Twentieth Century Limited), but again I don't know the charges. Certain documents would not be faxed such as photographs, or legally prohibited, such as drug prescriptions, naturalization certificates, legal tender, etc. I could understand prohibiting legal tender, but drug prescriptions and naturalization certificates are the kind of documents a traveller might need transmitted in a rush. --NYT, 12/3/1959, display ad. *I am amazed that anyone can sit at their desk today and, at no charge, receive stock quotes, stock history, and current analysis from many newspaper websites; that information that once was only available in a stockbroker's office to regular customers. Stockbrokers used the Western Union "900 speed" ticker to keep up. The Bunker Ramo company had stock-lookup computer terminals in the mid 1960s. [public replies, please] ------------------------------ TELECOM Digest is an electronic journal devoted mostly to telecom- munications topics. It is circulated anywhere there is email, in addition to Usenet, where it appears as the moderated newsgroup 'comp.dcom.telecom'. TELECOM Digest is a not-for-profit, mostly non-commercial educational service offered to the Internet by Patrick Townson. All the contents of the Digest are compilation-copyrighted. You may reprint articles in some other media on an occasional basis, but please attribute my work and that of the original author. The Telecom Digest is currently being moderated by Bill Horne while Pat Townson recovers from a stroke. Contact information: Bill Horne Telecom Digest 43 Deerfield Road Sharon MA 02067-2301 781-784-7287 bill at horne dot net Subscribe: telecom Unsubscribe: telecom This Digest is the oldest continuing e-journal about telecomm- unications on the Internet, having been founded in August, 1981 and published continuously since then. Our archives are available for your review/research. We believe we are the oldest e-zine/mailing list on the internet in any category! URL information: Anonymous FTP: (or use our mirror site: RSS Syndication of TELECOM Digest: For syndication examples see Copyright (C) 2008 TELECOM Digest. All rights reserved. Our attorney is Bill Levant, of Blue Bell, PA. ************************ --------------------------------------------------------------- Finally, the Digest is funded by gifts from generous readers such as yourself who provide funding in amounts deemed appropriate. Your help is important and appreciated. A suggested donation of fifty dollars per year per reader is considered appropriate. See our address above. Please make at least a single donation to cover the cost of processing your name to the mailing list. All opinions expressed herein are deemed to be those of the author. Any organizations listed are for identification purposes only and messages should not be considered any official expression by the organization. End of The Telecom digest (3 messages) ******************************

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