Talk:Robert Methven Petrie

External links modified (January 2018)
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I have just modified one external link on Robert Methven Petrie. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20130927090334/http://www.physicstoday.org/resource/1/phtoad/v19/i8/p95_s2?bypassSSO=1 to http://www.physicstoday.org/resource/1/phtoad/v19/i8/p95_s2?bypassSSO=1

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Cheers.— InternetArchiveBot  (Report bug) 22:50, 22 January 2018 (UTC)