GB176608A - Instruments for ascertaining the compass course of a ship - Google Patents

Instruments for ascertaining the compass course of a ship

Info

Publication number
GB176608A
GB176608A GB363321A GB363321A GB176608A GB 176608 A GB176608 A GB 176608A GB 363321 A GB363321 A GB 363321A GB 363321 A GB363321 A GB 363321A GB 176608 A GB176608 A GB 176608A
Authority
GB
United Kingdom
Prior art keywords
compass
line
disc
course
pin
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
GB363321A
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.)
JAMES CARRIE MCCRAE
Original Assignee
JAMES CARRIE MCCRAE
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 JAMES CARRIE MCCRAE filed Critical JAMES CARRIE MCCRAE
Priority to GB363321A priority Critical patent/GB176608A/en
Publication of GB176608A publication Critical patent/GB176608A/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
    • G01C21/20—Instruments for performing navigational calculations

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • Drawing Aids And Blackboards (AREA)

Abstract

176,608. McCrae, J. C. Jan. 31, 1921. Protractors; rulers.-Relates to instruments for use with a chart in order to convert a true course to a compass course and vice versa. One member 2 of a parallel ruler 1, 2 carries a pair of concentric rotatable discs 5, 6, with compass point graduations, adapted to be clamped together with the corresponding graduations separated by an angle equal to the compass error. The member 2 is divided and fitted with a bridge-piece 3 through which passes a pin 7 fixed to the larger disc 5. The smaller disc G, rotatable on this pin, fits into a recess in the disc 5, and is separated by a washer from the underside of the bridge.. piece 3. The threaded end of the pin 7 is fitted with a clamping thumb-nut 10. In using the instrument, the upper edge of the member 1 is set along the course line and the bar 2 is moved until the north and south points on the disc 5 are in line with a meridian on the chart. The true and compass courses are then indicated on the discs 5, 6 respectively opposite a line 11 on the member 2 in line with the centre of the discs.
GB363321A 1921-01-31 1921-01-31 Instruments for ascertaining the compass course of a ship Expired GB176608A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB363321A GB176608A (en) 1921-01-31 1921-01-31 Instruments for ascertaining the compass course of a ship

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB363321A GB176608A (en) 1921-01-31 1921-01-31 Instruments for ascertaining the compass course of a ship

Publications (1)

Publication Number Publication Date
GB176608A true GB176608A (en) 1922-03-16

Family

ID=9761988

Family Applications (1)

Application Number Title Priority Date Filing Date
GB363321A Expired GB176608A (en) 1921-01-31 1921-01-31 Instruments for ascertaining the compass course of a ship

Country Status (1)

Country Link
GB (1) GB176608A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761213A (en) * 1953-05-19 1956-09-04 Iversen Anfinn Johan Navigation instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761213A (en) * 1953-05-19 1956-09-04 Iversen Anfinn Johan Navigation instrument

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