GB146614A - Improvements in and relating to apparatus for use in solving nautical problems or plane and spherical trigonometry - Google Patents

Improvements in and relating to apparatus for use in solving nautical problems or plane and spherical trigonometry

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Publication number
GB146614A
GB146614A GB914019A GB914019A GB146614A GB 146614 A GB146614 A GB 146614A GB 914019 A GB914019 A GB 914019A GB 914019 A GB914019 A GB 914019A GB 146614 A GB146614 A GB 146614A
Authority
GB
United Kingdom
Prior art keywords
length
latitude
arc
nautical
plane
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.)
Expired
Application number
GB914019A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB914019A priority Critical patent/GB146614A/en
Publication of GB146614A publication Critical patent/GB146614A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/02—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by astronomical means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Astronomy & Astrophysics (AREA)
  • Automation & Control Theory (AREA)
  • General Physics & Mathematics (AREA)
  • Instructional Devices (AREA)

Abstract

146,614. Arimitsu, T. April 10, 1919. Spherical and plane trigonometry calculators for use, for example, in nautical astronomy, comprise a member having arms a, b and a graduated arc c with its centre at the point of intersection of the arms. The arc is graduated in degrees, and the arm a is provided with a uniformly divided scale of such dimensions that the radius OS of the arc is the unit of length. The parts may be made of transparent substances, upon the lower surfaces of which the scales are formed, or they may be made of metallic substances, the reading edges being bevelled. The device is used in conjunction with a Mercator's chart, of which L, Fig. 5, is a " parallel of latitude " and M a meridian. The methods are described in the Specification; in them the device is moved over the lines L and M in several ways with the centre of the are O always on the line M. and either the length of the tangent of the angle with the meridian as shown in Fig. 5, or the length of the sine as shown in Fig. 6, or the length O m as shown in Fig. 8, is maintained constant. The examples given are :-(1) Error in longitude due to 1' error in latitude, latitude and hour angle being known; (2) azimuth from hour angle, altitude, and declination.
GB914019A 1919-04-10 1919-04-10 Improvements in and relating to apparatus for use in solving nautical problems or plane and spherical trigonometry Expired GB146614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB914019A GB146614A (en) 1919-04-10 1919-04-10 Improvements in and relating to apparatus for use in solving nautical problems or plane and spherical trigonometry

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB914019A GB146614A (en) 1919-04-10 1919-04-10 Improvements in and relating to apparatus for use in solving nautical problems or plane and spherical trigonometry

Publications (1)

Publication Number Publication Date
GB146614A true GB146614A (en) 1920-07-12

Family

ID=9866128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB914019A Expired GB146614A (en) 1919-04-10 1919-04-10 Improvements in and relating to apparatus for use in solving nautical problems or plane and spherical trigonometry

Country Status (1)

Country Link
GB (1) GB146614A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5077910A (en) * 1990-11-26 1992-01-07 Smith Peter T Carpenter's measuring square

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5077910A (en) * 1990-11-26 1992-01-07 Smith Peter T Carpenter's measuring square

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