The Signaling Mirror: WWII US Military Training Film, August 1943

How to aim a double-sided signal mirror, August 1943 - a WWII US military training film, created to introduce the ESM/I emergency signaling mirror (over 1 million ESM/1s were produced in WWII).The OSS made the film for the US Navy and the ERE. The aiming principles illustrated and explained here apply to any double-sided signal mirror. The US military retired double-sided signal mirrors in favor of the more effective retroreflective-aimer ("reflex") signal mirrors after WWII, but many commercial liferaft kits are stocked with double-sided signal mirrors, and this technique can be used with many metal mirrors. I believe this film is in the public domain in the US, both as a US Govt work, and as a work published without copyright notice in 1943. I paid the US National Archives to digitize this film so I could upload it. I first did so in July 29, 2010 - I uploaded it again today because I hoped for better quality, given 8 years of progress. The only thing clearly better than the prior version is that the aspect ratio now matches (the first upload is "letterboxed") - other than that, I can't tell any difference - the file sizes is only 2% larger on UA-cam.