GB191419060A - Improvements in Reading Off Appliances on Tachymeters and Theodolites. - Google Patents

Improvements in Reading Off Appliances on Tachymeters and Theodolites.

Info

Publication number
GB191419060A
GB191419060A GB191419060DA GB191419060A GB 191419060 A GB191419060 A GB 191419060A GB 191419060D A GB191419060D A GB 191419060DA GB 191419060 A GB191419060 A GB 191419060A
Authority
GB
United Kingdom
Prior art keywords
telescope
theodolites
reading
passing
tachometers
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
Sigurd Baalsrud
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 GB191419060A publication Critical patent/GB191419060A/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
    • G01C3/00—Measuring distances in line of sight; Optical rangefinders
    • G01C3/26—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object
    • G01C3/28—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object with provision for reduction of the distance into the horizontal plane
    • G01C3/30—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with fixed angles and a base of variable length, at, near, or formed by the object with provision for reduction of the distance into the horizontal plane with adaptation to the measurement of the height of an object, e.g. tacheometers

Landscapes

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

Abstract

19,060. Baalsrud, S. Aug. 25. Theodolites and tachometers.-Relates to microscopic scale - reading devices for theodolites, tachometers, and similar angle-measuring instruments. As shown in plan (with the cover removed) in Fig. 1, and in vertical section through the line C-D in Fig. 1, the horizontal graduated circle 1 is illuminated by light reflected on to it after passing through an opening in the cover 4, beneath which are two microscopes 5 fixed to the pivot of the instrument. Two images of the opposite graduations are seen one above the other in the ocular 10, by means of two superposed reflecting-prisms 6, 7 and a reflecting-prism 8. For reading the vertical graduated circle, either one or two microscopes are carried by the telescope tube, with their axes intersecting that of the telescope, the rays of light passing through apertures in the telescope tube. The rays passing through the microscope nearest the eyepiece of the telescope are deflected by a prism into an ocular arranged parallel to the axis of the telescope.
GB191419060D 1914-08-25 1914-08-25 Improvements in Reading Off Appliances on Tachymeters and Theodolites. Expired GB191419060A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191419060T 1914-08-25

Publications (1)

Publication Number Publication Date
GB191419060A true GB191419060A (en) 1915-08-25

Family

ID=32648400

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191419060D Expired GB191419060A (en) 1914-08-25 1914-08-25 Improvements in Reading Off Appliances on Tachymeters and Theodolites.

Country Status (1)

Country Link
GB (1) GB191419060A (en)

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