GB191416537A - An Improvement in Tacheometrical Surveying Instruments. - Google Patents

An Improvement in Tacheometrical Surveying Instruments.

Info

Publication number
GB191416537A
GB191416537A GB191416537DA GB191416537A GB 191416537 A GB191416537 A GB 191416537A GB 191416537D A GB191416537D A GB 191416537DA GB 191416537 A GB191416537 A GB 191416537A
Authority
GB
United Kingdom
Prior art keywords
telescope
stadia
diaphragm
barrel
flange
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
Arthur Lovat Higgins
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 GB191416537A publication Critical patent/GB191416537A/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)
  • Reciprocating Pumps (AREA)

Abstract

16,537. Higgins, A. L. July 11. Tacheometers.-Rotatable stadia lines for giving reduced horizontal distances, as described in Specification 13,629/13, are turned automatically about the axis of the telescope as this is elevated or depressed. The barrel D, turning within the telescope 0 and carrying the stadia diaphragm d, has a small sphere K, fixed between flanges d<2>, d<3> and kept in contact with a vertical face p<2> on a rod P by means of a helical spring N which tends to rotate the barrel. The rod P has a knife-edge p<1> at one end which contacts with the edge of an annular cam-flange on a fixed plate I contained between the vertical circle G and a fixed casing C. The cam-flange is cut so that the requisite rotation is imparted to the stadia diaphragm d as the telescope and vertical circle G are turned,
GB191416537D 1914-07-11 1914-07-11 An Improvement in Tacheometrical Surveying Instruments. Expired GB191416537A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191416537T 1914-07-11

Publications (1)

Publication Number Publication Date
GB191416537A true GB191416537A (en) 1915-05-06

Family

ID=32585542

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191416537D Expired GB191416537A (en) 1914-07-11 1914-07-11 An Improvement in Tacheometrical Surveying Instruments.

Country Status (1)

Country Link
GB (1) GB191416537A (en)

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