File:Signal Mirror MIL-M-18371E Type I 2x3 glass.jpeg
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English: Hospital Corpsman 3rd Class Mark C. Robinson, a sailor attached to the Chemical Biological Incident Response Force, 2nd Marine Expeditionary Force, Indian Head, Maryland, signals a United States Air Force Huey Helicopter using "mirror signaling," a method that allows an aircraft to see the signal in daylight from up to twenty miles away, for a Medical Evacuation Exercise at the Hammer National Training and Education Center in Richland, Washington, on October 16, 2001. The Hammer National Training and Education Center allows personnel from the military and civilian sector to join together for realistic training exercises involving hazardous materials, emergency response teams, and firefighting. (Official USMC photo by Lance Corporal Joseph R. Price)
VIRIN: 011016-M-7121P-015" The mirror is a US military issue 2"x3" glass Mil. Std. MIL-M-18371E Type I signal mirror with a retroreflective mesh "reflex sight" aimer. The Mil Std is online at: http://www.tpub.com/content/MIL-SPEC/MIL-M/MIL-M-18371E/ The Mil Std requires that the edges of the mirror are painted flat black, as seen here. The National Stock Number for this type of mirror is NSN 6350-01-455-6695: MIRROR,EMERGENCY SIGNALING 3"x5" Glass, as described here: http://www.dlis.dla.mil/webflis/pub/pub_search.aspx?niin=6350014556695&newpage=1 The retroreflective material in "reflex sight" signal mirrors creates a virtual image of the sun in the direction of the column of light reflected by the mirror. This bright round fuzzy "fireball" is only visible to the user - it results from two reflections: the first when the retroreflective material reflects sunlight back towards the sun, the second when some of the retroreflected light reflects off the glass to air interface back through the mirror into the user's eye in the opposite direction of the main reflected ray from the mirror. This type of mesh aimer was described and patented by Richard S. Hunter, in his patent 2,557,108, filed Dec. 4, 1946, issued June 19, 1951, and available online here: http://www.google.com/patents?id=y35vAAAAEBAJ The fine mesh in this aimer indicates it was probably produced before 1980 - mirrors produced since then have coarser mesh. |
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| Author | USMC Lance Corporal Joseph R. Price |
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This file is a work of a United States Marine or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain.
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| current | 02:26, 7 February 2011 | | 3,000 × 2,100 (812 KB) | Heliograph (talk | contribs) | {{Information |Description= from the US Govt. website: "Hospital Corpsman 3rd Class Mark C. Robinson, a sailor attached to the Chemical Biological Incident Response Force, 2nd Marine Expeditionary Force, Indian Head, Maryland, signals a United States Air |
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