JPS56132513A - Direction finder - Google Patents
Direction finderInfo
- Publication number
- JPS56132513A JPS56132513A JP2638080A JP2638080A JPS56132513A JP S56132513 A JPS56132513 A JP S56132513A JP 2638080 A JP2638080 A JP 2638080A JP 2638080 A JP2638080 A JP 2638080A JP S56132513 A JPS56132513 A JP S56132513A
- Authority
- JP
- Japan
- Prior art keywords
- point
- map
- magnetic needle
- meccas
- angle
- Prior art date
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/02—Magnetic compasses
- G01C17/04—Magnetic compasses with north-seeking magnetic elements, e.g. needles
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Instructional Devices (AREA)
Abstract
PURPOSE:To perform an easy and rapid finding of a direction at a given point on a globe, such as meccas, by a method wherein an isogonic curve line, based on an directional angle against a magnetic needle at an optional point from a given point on a globe, is computed for drawing on a map. CONSTITUTION:A spherical angle beta of a spherical triangle, which is formed with a large circle A, consisting of a given point M, such as meccas, and a north pole N, a large circle C, consisting of the points M and N, is computed to conduct a correction based on a magnetic needle displacement angle gamma at the point X, and a direction angle alpha of the point X to the point M is then decided. Through the computation of said direction angle alpha in relation to each point, an isogonic line, based on the point M, is drawn on a map. Thus, the map is cut in as a brochure, and a direction indicator, providing with a magnetic needle on a clear base plate, easily and promptly performs a finding of a direction at a given point, such as meccas, corresponding to the directional angle of the isogonic curve line on the map through a direction indicated by the magnetic needle.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2638080A JPS56132513A (en) | 1980-03-03 | 1980-03-03 | Direction finder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2638080A JPS56132513A (en) | 1980-03-03 | 1980-03-03 | Direction finder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56132513A true JPS56132513A (en) | 1981-10-16 |
Family
ID=12191909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2638080A Pending JPS56132513A (en) | 1980-03-03 | 1980-03-03 | Direction finder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56132513A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5837512U (en) * | 1981-09-04 | 1983-03-11 | 横山磁石工業株式会社 | Magnet for confirming prayer direction in Islam |
EP0743576A1 (en) * | 1995-05-17 | 1996-11-20 | Asulab S.A. | Device indicating the direction of a given geographical location |
WO1998043044A1 (en) * | 1997-03-26 | 1998-10-01 | Qiblah International Industries Limited | A device for indicating direction |
-
1980
- 1980-03-03 JP JP2638080A patent/JPS56132513A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5837512U (en) * | 1981-09-04 | 1983-03-11 | 横山磁石工業株式会社 | Magnet for confirming prayer direction in Islam |
EP0743576A1 (en) * | 1995-05-17 | 1996-11-20 | Asulab S.A. | Device indicating the direction of a given geographical location |
CH688460GA3 (en) * | 1995-05-17 | 1997-10-15 | Asulab Sa | Device used to indicate the direction of a given geographic location. |
US5697162A (en) * | 1995-05-17 | 1997-12-16 | Asulab S.A. | Arrangement serving to indicate the direction of a given geographic location |
WO1998043044A1 (en) * | 1997-03-26 | 1998-10-01 | Qiblah International Industries Limited | A device for indicating direction |
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