GB234578A - Improvements in or relating to surveying instruments - Google Patents

Improvements in or relating to surveying instruments

Info

Publication number
GB234578A
GB234578A GB716924A GB716924A GB234578A GB 234578 A GB234578 A GB 234578A GB 716924 A GB716924 A GB 716924A GB 716924 A GB716924 A GB 716924A GB 234578 A GB234578 A GB 234578A
Authority
GB
United Kingdom
Prior art keywords
telescope
ring
lens
miners
graduations
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
GB716924A
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 GB716924A priority Critical patent/GB234578A/en
Publication of GB234578A publication Critical patent/GB234578A/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)

Abstract

234,578. Taylor, A., and Linn, J. D. March 20, 1924. Miners' dials.-In a miners' dial &c. having a telescope mounted to turn in azimuth and a stationary compass ring &c., a supplementary lens C' is provided which is detachably connected to the telescope A at the end functioning as the objective when it is desired to read the graduations on the ring B, the focal length of the lens being equal to its distance from the ring, so that an observer looking through the other end of the telescope sees a clear magnified image of the graduations. The lens C<1> is carried by a detachable mount C to which may also be hinged a mirror C<2> for illuminating the ring B. The telescope A is of the unit magnification type comprising two similar lenses A<1>, A<2> separated by a distance equal to twice the focal length of either, so that either lens can be used as the objective when sighting distant objects. Specification 215,981 is referred to.
GB716924A 1924-03-20 1924-03-20 Improvements in or relating to surveying instruments Expired GB234578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB716924A GB234578A (en) 1924-03-20 1924-03-20 Improvements in or relating to surveying instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB716924A GB234578A (en) 1924-03-20 1924-03-20 Improvements in or relating to surveying instruments

Publications (1)

Publication Number Publication Date
GB234578A true GB234578A (en) 1925-06-04

Family

ID=9827934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB716924A Expired GB234578A (en) 1924-03-20 1924-03-20 Improvements in or relating to surveying instruments

Country Status (1)

Country Link
GB (1) GB234578A (en)

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