GB190718571A - Improvements in Apparatus for Finding True Magnetic Divergence, applicable also for Finding Geographical Divergence - Google Patents

Improvements in Apparatus for Finding True Magnetic Divergence, applicable also for Finding Geographical Divergence

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Publication number
GB190718571A
GB190718571A GB190718571DA GB190718571A GB 190718571 A GB190718571 A GB 190718571A GB 190718571D A GB190718571D A GB 190718571DA GB 190718571 A GB190718571 A GB 190718571A
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United Kingdom
Prior art keywords
divergence
finding
magnetic
galvanometers
angles
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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Inventor
Louis Dominique Joseph Dunoyer
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Individual
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Individual
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Publication date
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Publication of GB190718571A publication Critical patent/GB190718571A/en
Expired legal-status Critical Current

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Abstract

18,571. Dunoyer, L. D. J. A. Aug. 16, 1906, [date applied for under Patents, Act, 1901]. Bearings, instruments for determining.-In an apparatus for finding true magnetic divergence, two exactly similar earth inductor coils are mounted side by side on a rotatable frame A, and connected to two galvanometers G, G<1> through split commutator rings a, band brushes c, d, either the commutator rings or the pairs of brushes being displaced angularly from one another by 90 degrees, for the purpose of producing deflexions in the galvanometer proportional to two rectangular components of the earth's horizontal field. The galvanometers are arranged with their axes of rotation at right-angles in an horizontal plane, and their mirrors reflect images of two threads or luminous filaments F placed at right-angles, on a translucent plate P, which has a vector scale marked with the points of the compass. The point of intersection of the two images when the frame A is rotated indicates the divergence of the ships course from the magnetic meridian, or from the geographical meridian, the plate P in the latter case being rotated through an angle equal to the magnetic declinatiou. The invention is a development of that of Specification No. 4609, A.D. 1907.
GB190718571D 1906-08-16 1907-08-16 Improvements in Apparatus for Finding True Magnetic Divergence, applicable also for Finding Geographical Divergence Expired GB190718571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR190718571X 1906-08-16

Publications (1)

Publication Number Publication Date
GB190718571A true GB190718571A (en) 1908-02-13

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ID=32606540

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GB190718571D Expired GB190718571A (en) 1906-08-16 1907-08-16 Improvements in Apparatus for Finding True Magnetic Divergence, applicable also for Finding Geographical Divergence

Country Status (1)

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GB (1) GB190718571A (en)

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