FR553005A - Improvements to surveying instruments - Google Patents

Improvements to surveying instruments

Info

Publication number
FR553005A
FR553005A FR553005DA FR553005A FR 553005 A FR553005 A FR 553005A FR 553005D A FR553005D A FR 553005DA FR 553005 A FR553005 A FR 553005A
Authority
FR
France
Prior art keywords
surveying instruments
surveying
instruments
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
Alvah Denton Hadsel
Frederick Nickerson Woods
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 filed Critical
Application granted granted Critical
Publication of FR553005A publication Critical patent/FR553005A/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)
FR553005D 1922-06-16 1922-06-16 Improvements to surveying instruments Expired FR553005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR553005T 1922-06-16

Publications (1)

Publication Number Publication Date
FR553005A true FR553005A (en) 1923-05-11

Family

ID=8937941

Family Applications (1)

Application Number Title Priority Date Filing Date
FR553005D Expired FR553005A (en) 1922-06-16 1922-06-16 Improvements to surveying instruments

Country Status (1)

Country Link
FR (1) FR553005A (en)

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