FR490640A - Testing device for 90 ° square - Google Patents

Testing device for 90 ° square

Info

Publication number
FR490640A
FR490640A FR490640DA FR490640A FR 490640 A FR490640 A FR 490640A FR 490640D A FR490640D A FR 490640DA FR 490640 A FR490640 A FR 490640A
Authority
FR
France
Prior art keywords
square
testing device
testing
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
Other languages
French (fr)
Inventor
Jeremie-Alphonse-Andre Peaudeau
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.)
JEREMIE ALPHONSE ANDRE PEAUDEA
Original Assignee
JEREMIE ALPHONSE ANDRE PEAUDEA
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 JEREMIE ALPHONSE ANDRE PEAUDEA filed Critical JEREMIE ALPHONSE ANDRE PEAUDEA
Application granted granted Critical
Publication of FR490640A publication Critical patent/FR490640A/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
    • 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
    • G01C17/10—Comparing observed direction with north indication
    • G01C17/12—Comparing observed direction with north indication by sighting means, e.g. for surveyors' compasses

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR490640D 1917-12-26 1917-12-26 Testing device for 90 ° square Expired FR490640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR490640T 1917-12-26

Publications (1)

Publication Number Publication Date
FR490640A true FR490640A (en) 1919-05-01

Family

ID=1526742

Family Applications (1)

Application Number Title Priority Date Filing Date
FR490640D Expired FR490640A (en) 1917-12-26 1917-12-26 Testing device for 90 ° square

Country Status (1)

Country Link
FR (1) FR490640A (en)

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