File:Signal Mirror Glass USAF MIL-M-18371E Type II.JPEG
Original file (1,900 × 2,800 pixels, file size: 1.51 MB, MIME type: image/jpeg)
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Summary
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| Description |
English: 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 |
| Date | |
| Source | US Government Web Site: http://dodimagery.afis.osd.mil/assetDetails.action?guid=177ced942f14b527fd0f7f79608101dd92ea81eb image name DF-ST-82-03772.JPEG |
| Author | Photographer: TSGT Bob Wickley, USAF, editor C. Tordesillas |
Licensing
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
| Annotations | This image is annotated: View the annotations at Commons |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:11, 5 February 2011 | | 1,900 × 2,800 (1.51 MB) | Heliograph (talk | contribs) | {{Information |Description ={{en|1=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 pa |
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