GB165915A - Improvements in or relating to surveying instruments - Google Patents
Improvements in or relating to surveying instrumentsInfo
- Publication number
- GB165915A GB165915A GB692720A GB692720A GB165915A GB 165915 A GB165915 A GB 165915A GB 692720 A GB692720 A GB 692720A GB 692720 A GB692720 A GB 692720A GB 165915 A GB165915 A GB 165915A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scales
- reflector
- scale
- lath
- telescope
- 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
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
165,915. Shaw, J. P. March 6, 1920. Theodolites; angle-measuring instruments.-Relates to instruments for the measurements of angles and distances, of the kind comprising a telescope with an extension at right-angles to its axis, this extension having at its outer end a reflector attached to a pivoted lath &c., which reflector co-operates with a fixed reflector within the telescope to produce an image which can be brought into coincidence with a .direct image by turning the lath. The invention consists in the manner of graduating the circles &c. and in the general construction of the instrument. As shown in Figs. 1 and 2, each of the circles of the instrument carries two concentric scales, of equal width, the outer scale E being a scale of tangents whilst the inner scale F is divided equiangularly. Only one quadrant is shown in the Figure. To facilitate the reading by means of a micrometer of fractions of the smaller divisions on the scales, the actual scale markings consist of the diagonal lines connecting opposite ends of successive divisions as shown in Fig. 2. The distance to be subdivided by the micrometer is then the constant width of the scales. The micrometer comprises a microscope - 5 with pointers 6, Fig. 3, mounted so as to be traversed radially across the scales by a differential screw 8, 9 having an evenly divided head 10. The microscope is moved until the pointer intersects the diagonal graduation line on the scale, the traverse for a complete turn of the head 10 being equal to the radial width of the scales. The instrument comprises a telescope 21, Figs. 5 and 7, rotatable in altitude and azimuth and having at right angles to its axis a rigid tube 24 carrying at its outer end H a reflector 23 attached to a pivoted lath 28. The field of the telescope is partly occupied by a. reflector 25 receiving light directed along the tube 24 by the reflector 23 so that two images of an observed object are seen in the eyepiece 20. These images can be brought into coincidence by turning the lath 28, the angle of rotation being read on scales 29 graduated as above described. For levelling the instrument the horizontal circle 36 carries two diametrically opposite pins 52. One of the pins engages in a bracket 44 pivoted at 43 in a channel iron 42 secured to an arm 48. The bracket carries a toothed sector 45, Fig. 9, which can be rotated by a worm 46. The other pin 52 passes into a block 50, Fig. 8, which is pivoted at 51 in a fork 49 which can be adjusted vertically by a screw 53 bearing in an arm 54. The arms 48, 54 may be integral with a ring 56 which can be clamped to the tripod head by screens 57.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB692720A GB165915A (en) | 1920-03-06 | 1920-03-06 | Improvements in or relating to surveying instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB692720A GB165915A (en) | 1920-03-06 | 1920-03-06 | Improvements in or relating to surveying instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB165915A true GB165915A (en) | 1921-07-06 |
Family
ID=9823378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB692720A Expired GB165915A (en) | 1920-03-06 | 1920-03-06 | Improvements in or relating to surveying instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB165915A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109540086A (en) * | 2019-01-28 | 2019-03-29 | 中交公局重庆城市建设发展有限公司 | Small base tunnel director and its pointing method |
-
1920
- 1920-03-06 GB GB692720A patent/GB165915A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109540086A (en) * | 2019-01-28 | 2019-03-29 | 中交公局重庆城市建设发展有限公司 | Small base tunnel director and its pointing method |
CN109540086B (en) * | 2019-01-28 | 2023-12-22 | 中交一公局重庆隧道工程有限公司 | Small pilot pit pointing instrument and pointing method thereof |
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