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| View Original: | Signal_Mirror_Glass_USAF_MIL-M-18371E_Type_II.JPEG (1900x2800) | |||
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| Keywords: Signal Mirror Glass USAF MIL-M-18371E Type II.JPEG en Per the dodimagery afis osd mil website where this photo was found A combat control team member TSGT Richard Heins uses a signal mirror to signal an approaching C-141 Starlifter aircraft that is transporting paratroopers into a drop zone The airman is a 317th Tactical Air Wing member participating in exercise Reforger '80 The mirror is a standard issue MilSpec MIL-M-18371E Type II 3 x5 glass mirror The MilSpec can be found here http //www tpub com/content/MIL-SPEC/MIL-M/MIL-M-18371E/ Per section 3 2 of that spec the mirror uses two layers of 1/8 glass laminated with polyvinyl butyral with a sighting device of 30x30 stainless steel mesh coated on both sides with wide-angle retroreflective material and the back and all the edges painted flat black The way this type of mirror is aimed is that the aiming mesh creates a glowing fireball virtual image of the sun visible only to someone looking through the rear of the aimer The reflected light from the mirror is in the same direction as the apparent direction of the fireball so the user simply tilts the mirror to place the fireball on the target This type of aimer was patented in 1951 by Richard S Hunter US Patent 2 557 108 which can be viewed here http //www google com/patents id y35vAAAAEBAJ US Government Web Site http //dodimagery afis osd mil/assetDetails action guid 177ced942f14b527fd0f7f79608101dd92ea81eb image name DF-ST-82-03772 JPEG Photographer TSGT Bob Wickley USAF editor C Tordesillas 1980-09-01 PD-USGov ImageNote 1 359 812 607 369 1900 2800 2 Military issue 3 x5 glass signal mirror Mil-Std MIL-M-18371E with retroreflective mesh reflex aimer The Mil-STDj can be read online here http //www tpub com/content/MIL-SPEC/MIL-M/MIL-M-18371E/ ImageNoteEnd 1 ImageNote 2 14 1395 196 247 1900 2800 2 Nylon Lanyard Per the U S Military Standard section 3 4 3 Lanyard - A four foot length of the nylon cord shall be passed through the hole and the ends shall be tied together with a square knot for suspending the mirror from the neck of the user The ends of the cord shall be seared to prevent raveling and no sharp edges shall be formed The lanyard shall be fabricated from one continuous length of the cord ImageNoteEnd 2 ImageNote 3 574 933 121 126 1900 2800 2 The retroreflective mesh aimer that produces a bright fuzzy round virtual sun visible only through the aimer in the direction of the column of the reflected light The user aims the beam by tilting the mirror so the bright round spot overlays the target ImageNoteEnd 3 Signalling mirrors REFORGER 1980 | ||||
