FR2420117A1 - Air and sea navigation instrument - includes protractor scale with graduated sector pivoted about centre of graduated semicircle - Google Patents

Air and sea navigation instrument - includes protractor scale with graduated sector pivoted about centre of graduated semicircle

Info

Publication number
FR2420117A1
FR2420117A1 FR7807086A FR7807086A FR2420117A1 FR 2420117 A1 FR2420117 A1 FR 2420117A1 FR 7807086 A FR7807086 A FR 7807086A FR 7807086 A FR7807086 A FR 7807086A FR 2420117 A1 FR2420117 A1 FR 2420117A1
Authority
FR
France
Prior art keywords
graduated
sector
centre
graduations
air
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.)
Granted
Application number
FR7807086A
Other languages
French (fr)
Other versions
FR2420117B1 (en
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.)
MASSARO NEONELLO
Original Assignee
MASSARO NEONELLO
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 MASSARO NEONELLO filed Critical MASSARO NEONELLO
Priority to FR7807086A priority Critical patent/FR2420117A1/en
Priority to DE19792953661 priority patent/DE2953661A1/en
Priority to PCT/FR1979/000022 priority patent/WO1979000746A1/en
Priority to GB8040264A priority patent/GB2067299B/en
Priority to CH896880A priority patent/CH644690A5/en
Priority to EP19790900256 priority patent/EP0011623A1/en
Publication of FR2420117A1 publication Critical patent/FR2420117A1/en
Application granted granted Critical
Publication of FR2420117B1 publication Critical patent/FR2420117B1/fr
Granted 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)
  • Electromechanical Clocks (AREA)

Abstract

The navigation instrument comprises a rectangular transparent plate on which two sets (1, 2) of angular graduations are marked. The graduations are centered on a common centre point (6) near one of the long edges of the plate. A movable sector is attached by a pivot at the centre point so as to move over the sets of graduations. In addition to a needle (7) marking the centre of the sector, there are further graduations on the sector indicating up to 20 degrees either side of the needle. A stop limits the movement of the sector to 90 degrees either side of the midpoint. The instrument may be used for measuring angles in air or sea navigation and allows for an angular correction to be made in readings taken. This allows for differences between true north and magnetic north or the north direction as indicated by any compass used.
FR7807086A 1978-03-13 1978-03-13 Air and sea navigation instrument - includes protractor scale with graduated sector pivoted about centre of graduated semicircle Granted FR2420117A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR7807086A FR2420117A1 (en) 1978-03-13 1978-03-13 Air and sea navigation instrument - includes protractor scale with graduated sector pivoted about centre of graduated semicircle
DE19792953661 DE2953661A1 (en) 1978-03-13 1979-03-07 AIR AND SEA NAVIGATION INSTRUMENT
PCT/FR1979/000022 WO1979000746A1 (en) 1978-03-13 1979-03-07 Air and sea navigation instrument
GB8040264A GB2067299B (en) 1978-03-13 1979-03-07 Air and sea navigation instrument
CH896880A CH644690A5 (en) 1978-03-13 1979-03-07 ANGLE MEASURING INSTRUMENT.
EP19790900256 EP0011623A1 (en) 1978-03-13 1979-10-09 Air and sea navigation instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7807086A FR2420117A1 (en) 1978-03-13 1978-03-13 Air and sea navigation instrument - includes protractor scale with graduated sector pivoted about centre of graduated semicircle

Publications (2)

Publication Number Publication Date
FR2420117A1 true FR2420117A1 (en) 1979-10-12
FR2420117B1 FR2420117B1 (en) 1980-11-07

Family

ID=9205662

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7807086A Granted FR2420117A1 (en) 1978-03-13 1978-03-13 Air and sea navigation instrument - includes protractor scale with graduated sector pivoted about centre of graduated semicircle

Country Status (1)

Country Link
FR (1) FR2420117A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB573828A (en) * 1943-10-06 1945-12-07 Robert Lansdown Improvements in or relating to protractors for measuring angles
US3059339A (en) * 1959-05-04 1962-10-23 Eastern Co Navigational device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB573828A (en) * 1943-10-06 1945-12-07 Robert Lansdown Improvements in or relating to protractors for measuring angles
US3059339A (en) * 1959-05-04 1962-10-23 Eastern Co Navigational device

Also Published As

Publication number Publication date
FR2420117B1 (en) 1980-11-07

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Legal Events

Date Code Title Description
ST Notification of lapse