File:NavigationResearch 016.jpg

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Fig. 23- Radio direction finder or coil aerial used in measuring the distortion of radio waves in the vicinity of trees, towers, wires, buildings, etc. Fig. 24- Model set up in the radio laboratory to illustrate the use of the radio direction finder. Radio signals were sent out from the two lighthouses and the direction from whence they came was determined by the apparatus on the ship. The latter could therefore determine its position even in fog and under other conditions which rendered the lighthouse lamp invisible. (From: NBS Special Publication 46)

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National Institute of Standards and Technology

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National Institute of Standards and Technology

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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This image is in the public domain in the United States because it is a work of the United States Federal Government, specifically an employee of the National Institute of Standards and Technology, under the terms of Title 17, Chapter 1, Section 105 of the US Code.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:30, 6 March 2014		3,528 × 5,375 (17.91 MB)	NISTResearchLibrary (talk \| contribs)

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Image title	Fig. 23- Radio direction finder or coil aerial used in measuring the distortion of radio waves in the vicinity of trees, towers, wires, buildings, etc. Fig. 24- Model set up in the radio laboratory to illustrate the use of the radio direction finder. Radio signals were sent out from the two lighthouses and the direction from whence they came was determined by the apparatus on the ship. The latter could therefore determine its position even in fog and under other conditions which rendered the lighthouse lamp invisible. (From: NBS Special Publication 46)
Author	National Institute of Standards and Technology
Copyright holder	The images in the Navigation Research Photographic Collection are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the individual works to make sure there are no copyright restrictions indicated. Individual works may require securing other permissions from the original copyright holder. Use of the images from NIST Digital Collections is not restricted, but a statement of attribution is required. Please use the following attribution statement: "National Institute of Standards and Technology Digital Collections, Gaithersburg, MD 20899."
Headline	National Institute of Standards and Technology
Source	Navigation Research Photographic Collection
Short title	Radio direction finder
Width	3,528 px
Height	5,375 px
Bits per component	8 8 8
Compression scheme	Uncompressed
Pixel composition	RGB
Orientation	Normal
Number of components	3
Horizontal resolution	600 dpi
Vertical resolution	600 dpi
Data arrangement	chunky format
Software used	Adobe Photoshop CS6 (Windows)
File change date and time	14:00, 30 May 2013
Exif version	2.21
Color space	Uncalibrated
Date and time of digitizing	05:32, 24 April 2013
Date metadata was last modified	10:00, 30 May 2013
Unique ID of original document	xmp.did:CAD10933E4ACE21194E393123AD13CA4
Keywords	United States. National Bureau of Standards--History--Photograph collections. Subject: Navigation--Research--Photograph collections. Subject: Navigation (Aeronautics)--Photograph collections. Subject: Radio beacons--Photograph collections. Subject: Radio compass--Photograph collections. Subject: Radio direction finders--Photograph collections. Subject: Instrument landing systems--Photograph collections. Subject: Runway localizing beacons--Photograph collections. Subject: Earth inductor compass--Photograph collections. Subject: Fog glidometer--Photograph collections.
Contact information	library@nist.gov 100 Bureau Dr, MS 2500 Gaithersburg, MD, 20899 301-975-3052
IIM version	4

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