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Source page: |
http://commons.wikimedia.org/wiki/File:NavigationResearch_019.jpg |
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Summaryedit
Description |
This new type of compass was developed for the U. S. Army Air Service in 1921 by Doctors Paul R. Heyl and Lyman J. Briggs of NBS. The conductor consisted of a cross-shaped armature carrying a closed coil of wire which was rapidly revolved in the magnetic field of the earth, thus generating a current, the intensity of which depended upon the orientation of the coil with respect to the magnetic field. The pilot had before him on his instrument board a movable dial bearing compass graduations on which the desired compass course was set off. When the airplane was on this course the needle of a small galvanometer on the instrument board continually pointed to zero. A deflection of the needle from one side or the other indicated a corresponding deviation from the predetermined course. The earth inductor itself was located in the fuselage back of the rear cockput where it was free from magnetic disturbances due to the engine. It was driven by a small cup propeller projecting through the fuselage. For this device, Heyl and Briggs received the Magellan Medal from the American Philosophical Society. This compass wa successfully used in round-the-world flights by American aviators. Ultimately it was replaced by improved magnetic compasses, simpler in design and operation. |
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Date | ||||
Source | National Institute of Standards and Technology | |||
Author | National Institute of Standards and Technology | |||
Permission (Reusing this file) |
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Licensingedit
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. See Copyright.
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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EXIF data: | |
File name | navigationresearch_019.jpg |
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Size, Mbytes | 21.219963867187 |
Mime type | image/jpeg |
Orientation of image | 1 |
Image resolution in width direction | 600 |
Image resolution in height direction | 600 |
Unit of X and Y resolution | 2 |
Exif version | 0221 |
Color space information | 65535 |
Exif image width | 4701 |
Exif image length | 5741 |
Software used | Adobe Photoshop CS6 (Windows) |
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." |
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