GB190911327A - Improved Angle-measuring Surveying Instrument. - Google Patents

Improved Angle-measuring Surveying Instrument.

Info

Publication number
GB190911327A
GB190911327A GB190911327DA GB190911327A GB 190911327 A GB190911327 A GB 190911327A GB 190911327D A GB190911327D A GB 190911327DA GB 190911327 A GB190911327 A GB 190911327A
Authority
GB
United Kingdom
Prior art keywords
mirrors
reading
sighting
instrument
surveying instrument
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
Inventor
James Catt
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
Application granted granted Critical
Publication of GB190911327A publication Critical patent/GB190911327A/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
    • G01C1/00—Measuring angles
    • G01C1/08—Sextants

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Telescopes (AREA)

Abstract

11,327. Catt, J. May 13. Sextants.-An instrument which can be used as a single or double sextant comprises a casing having, at the end opposite to the sighting- device p, three apertures having sighting lines or slots o<2>, o<4>, Fig. 6, the images of the objects observed being brought into coincidence with the sighting-marks in the outer apertures by adjusting the mirrors h, the arms c, d carrying these mirrors crossing one another and reading on scales on each side of the centre. The arm c is cranked and passes under the lid of the box, but has its reading-end c<2> projecting as shown. The horizon mirrors can be adjusted so that the instrument can be used in the ordinary coincidence method; a compass with a reading-prism q<1> is fitted; and a handle in the shape of a hinged trigger-guard is provided to facilitate handling.
GB190911327D 1909-05-13 1909-05-13 Improved Angle-measuring Surveying Instrument. Expired GB190911327A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190911327T 1909-05-13

Publications (1)

Publication Number Publication Date
GB190911327A true GB190911327A (en) 1910-05-12

Family

ID=32444280

Family Applications (1)

Application Number Title Priority Date Filing Date
GB190911327D Expired GB190911327A (en) 1909-05-13 1909-05-13 Improved Angle-measuring Surveying Instrument.

Country Status (1)

Country Link
GB (1) GB190911327A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822480A (en) * 1972-11-10 1974-07-09 J Rolefson Position locating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822480A (en) * 1972-11-10 1974-07-09 J Rolefson Position locating device

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