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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Re: SWR-off topic |
| From: | "M. J. Powell" <[email protected]> |
| Date: | Sun, 16 Jan 2005 23:38:52 +0000 |
| In-reply-to: | <003501c4fc11$e6b3c080$7c3f8351@w4o8m9> |
| References: | <41EA3B2E.152.BF48D9@localhost> <000401c4fb13$98ef8180$f8ce28c3@erica> <003501c4fc11$e6b3c080$7c3f8351@w4o8m9> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Turnpike/6.01-S (<BN9Bj5xaTuEEoRpfPjYmxNjLmM>) |
In message <003501c4fc11$e6b3c080$7c3f8351@w4o8m9>, James Moritz
<[email protected]> 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 |
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