Return-Path: Received: (qmail 34387 invoked from network); 17 Jan 2005 10:30:52 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 17 Jan 2005 10:30:52 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CqU6A-0003Sy-Ja for dave@picks.force9.co.uk; Mon, 17 Jan 2005 10:27:03 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CqU6A-0003Sj-Ce for dave@picks.force9.co.uk; Mon, 17 Jan 2005 10:27:02 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1CqU9q-0000Ja-GA for dave@picks.force9.co.uk; Mon, 17 Jan 2005 10:30:50 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CqU72-0008IV-34 for rs_out_1@blacksheep.org; Mon, 17 Jan 2005 10:27:56 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CqU71-0008IM-Oz for rsgb_lf_group@blacksheep.org; Mon, 17 Jan 2005 10:27:55 +0000 Received: from anchor-post-30.mail.demon.net ([194.217.242.88]) by relay.thorcom.net with esmtp (Exim 4.43) id 1CqU6z-0007su-EL for rsgb_lf_group@blacksheep.org; Mon, 17 Jan 2005 10:27:55 +0000 Received: from pickmere.demon.co.uk ([158.152.117.143]) by anchor-post-30.mail.demon.net with esmtp (Exim 4.42) id 1CqU6m-000L4C-02 for rsgb_lf_group@blacksheep.org; Mon, 17 Jan 2005 10:27:40 +0000 Message-ID: Date: Sun, 16 Jan 2005 23:38:52 +0000 To: rsgb_lf_group@blacksheep.org From: "M. J. Powell" References: <41EA3B2E.152.BF48D9@localhost> <000401c4fb13$98ef8180$f8ce28c3@erica> <003501c4fc11$e6b3c080$7c3f8351@w4o8m9> In-Reply-To: <003501c4fc11$e6b3c080$7c3f8351@w4o8m9> MIME-Version: 1.0 User-Agent: Turnpike/6.01-S () X-SPF-Result: relay.thorcom.net: 194.217.242.88 is neither permitted nor denied by domain of pickmere.demon.co.uk X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=no,DATE_IN_PAST_06_12=0.211 Subject: Re: LF: Re: SWR-off topic Content-Type: text/plain; charset=us-ascii; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.6 required=5.0 tests=DATE_IN_PAST_06_12 autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit In message <003501c4fc11$e6b3c080$7c3f8351@w4o8m9>, James Moritz writes >Dear Peter, LF Group, > >I think the mathematical theory of transmission lines evolved with the >appearance of long-distance telegraph lines, but measuring standing waves >could only have become practical with the appearance of HF radio. In some >pre-war papers I have seen descriptions of little trolleys carrying >thermocouple ammeters that could be pulled along an open-wire line (there is >a rather vague description in Terman's "Radio Engineering"), This was done at Marconi College when I was with the company '52 - '55. Binoculars were provided to read the ammeter... Mike -- M.J.Powell