GB191011000A - Improvements in or relating to Surveying Instruments. - Google Patents

Improvements in or relating to Surveying Instruments.

Info

Publication number
GB191011000A
GB191011000A GB191011000DA GB191011000A GB 191011000 A GB191011000 A GB 191011000A GB 191011000D A GB191011000D A GB 191011000DA GB 191011000 A GB191011000 A GB 191011000A
Authority
GB
United Kingdom
Prior art keywords
lens
compass
points
box
bearing
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 Caughey Walker
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 GB191011000A publication Critical patent/GB191011000A/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

Abstract

11,000. Walker, J. C. May 4, Prismatic compasses.-An instrument for use in surveying comprises a box A in which a compass D of the floating-dial type is mounted upon a pin E. A lens L, on which is marked a central line M, is attached to the lid B, and is placed in the principal focal plane of an object lens J mounted on the box, the distance being measured horizontally to a mirror U and vertically to the lens L. In taking a bearing, the image of the object cast by the lens J is made to coincide with the line M, and the reading of the compass is taken. The true north bearing is obtained by setting an indicator H to correspond to the local variation. Horizontal and vertical scales P, S and a movable pointer Q working across the scale P are provided close to the lens L, so that the angle between any two points can be obtained by observing the points on the scales with which their images coincide.
GB191011000D 1910-05-04 1910-05-04 Improvements in or relating to Surveying Instruments. Expired GB191011000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191011000T 1910-05-04

Publications (1)

Publication Number Publication Date
GB191011000A true GB191011000A (en) 1911-05-04

Family

ID=32561525

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191011000D Expired GB191011000A (en) 1910-05-04 1910-05-04 Improvements in or relating to Surveying Instruments.

Country Status (1)

Country Link
GB (1) GB191011000A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082663A (en) * 1960-02-02 1963-03-26 Zweifel Peter Multi-purpose magnetic pocket compass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082663A (en) * 1960-02-02 1963-03-26 Zweifel Peter Multi-purpose magnetic pocket compass

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