File:AEC Top Secret Cover Sheet (6520387149).jpg

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Description	A "Top Secret" cover sheet from the US Atomic Energy Commission. This particular form dates from 1949, and was used through at least the early 1950s. This specimen comes from the papers of the Joint Committee on Atomic Energy, in the Legislative Archives, U.S. National Archives, and was attached to a document from 1953.
Date	17 June 2009, 04:35
Source	AEC Top Secret Cover Sheet
Author	RestrictedData from Washington, DC

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This image was originally posted to Flickr by RestrictedData at https://flickr.com/photos/69537337@N02/6520387149. It was reviewed on 5 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

5 September 2015

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	13:36, 5 September 2015		800 × 1,056 (403 KB)	Glunggenbauer (talk \| contribs)	Transferred from Flickr via Flickr2Commons

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This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Camera manufacturer	Canon
Camera model	Canon PowerShot SD450
Exposure time	1/80 sec (0.0125)
F-number	f/2.8
Date and time of data generation	04:35, 17 June 2009
Lens focal length	5.8 mm
Width	2,592 px
Height	1,944 px
Bits per component	8 8 8
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	180 dpi
Vertical resolution	180 dpi
Software used	Adobe Photoshop CS5 Macintosh
File change date and time	16:28, 15 December 2011
Y and C positioning	Centered
Exif version	2.2
Date and time of digitizing	04:35, 17 June 2009
Meaning of each component	Y Cb Cr does not exist
Image compression mode	5
APEX shutter speed	6.3125
APEX aperture	2.96875
APEX exposure bias	0
Maximum land aperture	2.96875 APEX (f/2.8)
Subject distance	0.28 meters
Metering mode	Pattern
Flash	Flash did not fire, compulsory flash suppression
Supported Flashpix version	1
Color space	Uncalibrated
Focal plane X resolution	11,520
Focal plane Y resolution	11,571.428571429
Focal plane resolution unit	inches
Sensing method	One-chip color area sensor
File source	Digital still camera
Custom image processing	Normal process
Exposure mode	Auto exposure
White balance	Manual white balance
Digital zoom ratio	1
Scene capture type	Standard
Lens used	5.8-17.4 mm
Date metadata was last modified	11:28, 15 December 2011
Unique ID of original document	xmp.did:F97F117407206811AE569A79D1689595

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File:AEC Top Secret Cover Sheet (6520387149).jpg

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