GB215981A - Improvements in or relating to surveying instruments for mining purposes - Google Patents

Improvements in or relating to surveying instruments for mining purposes

Info

Publication number
GB215981A
GB215981A GB1439023A GB1439023A GB215981A GB 215981 A GB215981 A GB 215981A GB 1439023 A GB1439023 A GB 1439023A GB 1439023 A GB1439023 A GB 1439023A GB 215981 A GB215981 A GB 215981A
Authority
GB
United Kingdom
Prior art keywords
bracket
telescope
box
relating
miners
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
GB1439023A
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
Priority to GB1439023A priority Critical patent/GB215981A/en
Publication of GB215981A publication Critical patent/GB215981A/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)
  • Telescopes (AREA)
  • Lenses (AREA)

Abstract

215,981. Taylor, A., and Linn, J. D. May 31, 1923. Miners' dials.-The sighting-means in a miners' dial consists of a telescope of unit magnification. The telescope A consists of two similar lenses a equidistant from a diaphragm or cross-wires a<x> so that either lens can be used as the eyepiece. The telescope is mounted in a holder A<1> provided with a pivot a<1> by which it is rotatably mounted in a bracket B, discs a<2> , b<2> graduated on their peripheries and carried by the holder and bracket respectively, being provided to form a vernier scale for indicating the inclination of the telescope to the horizontal. The bracket B is mounted on the compass box C and is provided with means for setting it at one or more definite inclinations to the vertical, these means comprising two radial keys b carried by the bracket and adapted to engage in corresponding pairs of radially disposed depressions on the box C. The bracket can be secured to the box in any of these positions by screws b<1>.
GB1439023A 1923-05-31 1923-05-31 Improvements in or relating to surveying instruments for mining purposes Expired GB215981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1439023A GB215981A (en) 1923-05-31 1923-05-31 Improvements in or relating to surveying instruments for mining purposes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1439023A GB215981A (en) 1923-05-31 1923-05-31 Improvements in or relating to surveying instruments for mining purposes

Publications (1)

Publication Number Publication Date
GB215981A true GB215981A (en) 1924-05-22

Family

ID=10040316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1439023A Expired GB215981A (en) 1923-05-31 1923-05-31 Improvements in or relating to surveying instruments for mining purposes

Country Status (1)

Country Link
GB (1) GB215981A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021601A (en) * 1957-05-15 1962-02-20 Brice E Hayes Track lining scope

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3021601A (en) * 1957-05-15 1962-02-20 Brice E Hayes Track lining scope

Similar Documents

Publication Publication Date Title
GB504845A (en) Improvements in or connected with optical sighting apparatus
GB556379A (en) Improvements in or relating to builder&#39;s levels
GB215981A (en) Improvements in or relating to surveying instruments for mining purposes
GB774437A (en) Auxiliary instrument for the use with levelling instruments
GB503065A (en) Improvements in levels and inclinometers
GB229077A (en) An instrument by means of which an observer can ascertain at a glance, the course onwhich an enemy ship or airship is steering
US1401380A (en) Surveying instrument
GB205445A (en) Improvements in levelling instruments
US652109A (en) Sun-dial.
GB344108A (en) Improvements in or relating to levels or plumbs
GB191322499A (en) An Improved Pocket Theodolite.
SU62586A1 (en) Adaptation to theodolite for optical centering relative to the frame
US2053837A (en) Stadia instrument
GB191516301A (en) Improvements in Sight Compasses.
GB731469A (en) Improvements relating to baskets
GB148306A (en) Instrument for measuring distances
GB190618719A (en) Improvements in or relating to Theodolites or similar Instruments.
USD85912S (en) A cobpobation op dela
GB191407107A (en) Improvements in or relating to Surveying Instruments.
GB496025A (en) Sighting instrument for measuring angles
GB1303938A (en)
GB234578A (en) Improvements in or relating to surveying instruments
GB147305A (en) An improved inclinometer for use on aircraft or other bodies
GB322357A (en) Apparatus for indicating the vertical
GB116808A (en) Improvements in Clinometers.