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Posted By: Pete on: 12/03/2004 08:55:05 EDT
Subject: RE: Signal Research and Development

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Walt,
If you go to the Cornell Making of America website, http://cdl.library.cornell.edu, click browse and then Scientific American, simple searches for "parabolic reflector" and "Fresnel light" will turn up some information. The subject has more to do with lighthouses than with field signals.
Henry J. Rogers, whose letter is reproduced in the parent message, did extensive research at the Washington Navy Yard on making submarine telegraph cable insulated with gutta percha more durable. Apparently friction or heat while unspooling the cable could wear the gutta percha off.
Pete
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