(6/5/2013) The three links at the bottom of footnote 2 above are broken - use the links below (the forum won't let me fix the original post).

Originally Posted By: rafowell

[2] In both American and British testing during WWII, the test

<snip> The links below should now work properly (6/5/2013) <snip>

Long report on american tests (margin clipped, alas)in
"Heliographic Signaling Mirrors", Richard S. Hunter, National Bureau of Standards,
Air-Sea Rescue (published by the US Coast Guard), March 1946 pp. 24-29, 48
Link to start of article
Testing: "Section VII: Comparative Test of Signaling Mirrors"(right column)
Link to section describing of signal mirror test
Link to section summarizing test results



Edited by rafowell (07/06/13 11:09 PM)
Edit Reason: no change, I think
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)