File:NavigationResearch 019.jpg

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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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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.

English ∙ 日本語 ∙ македонски ∙ Nederlands ∙ +/−

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:32, 6 March 2014		4,701 × 5,741 (20.72 MB)	NISTResearchLibrary (talk \| contribs)

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Image title	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.
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	Earth inductor compass for use on airplanes
Width	4,701 px
Height	5,741 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
Unique ID of original document	28F57040661A1B57D8BF3EBA843613CF
Original transmission location code	2738
Date metadata was last modified	10:00, 30 May 2013
Date and time of digitizing	05:48, 24 April 2013
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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