GB761804A - Improvements relating to levels - Google Patents
Improvements relating to levelsInfo
- Publication number
- GB761804A GB761804A GB10233/54A GB1023354A GB761804A GB 761804 A GB761804 A GB 761804A GB 10233/54 A GB10233/54 A GB 10233/54A GB 1023354 A GB1023354 A GB 1023354A GB 761804 A GB761804 A GB 761804A
- Authority
- GB
- United Kingdom
- Prior art keywords
- level
- reticle
- suspended
- elements
- objective system
- 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
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/02—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels involving automatic stabilisation of the line of sight
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Telescopes (AREA)
Abstract
761,804. Levels. FILOTECNICA SALMOIRAGHI SOC. PER AZIONI. April 7, 1954 [April 8, 1953], No. 10233/54. Class 97(2) In a level which in its operating position has' part of its optical axis substantially ver- .tical and which has a sighting reticle 4 and an objective system 1-3, which forms an image of the observed field on the reticle, either the reticle 4 as shown carried by heavy plate 15 or at least one component of the objective system is positioned on said vertical optical axis and is pendularly suspended by a system of n elements each of length l = f.+ 2#(EJn/P) where # is the focal length of the objective system, E is: Young' s modulus for the suspension elements, J is the moment of inertia of the cross section of such an element, P is the weight of the suspended part, whereby small movements of the level are compensated by movement of the suspended part so that the irnageof the observed field remains fixed relatively to the reticle. Preferably there are two suspension elements or groups of elements with theirupper ends fixed at spaced positions and supporting, at their lower ends in similar positions the suspended part on opposite sides of its centre the suspended part being submerged in a transparent liquid damping bath as at 16. A fixed reference recticle 8 and an eyepiece system 9 provide a check on the positioning of the level and the free suspension of the sighting reticle 4 which is brought to the view of the eyepiece by the optical system 5-7. In a modification (Fig. 4 not shown) a part of the objective system is pendularly suspended and the pentagonal prisms 1, 7 are replaced by 45 degree prisms, the eyepieces is below the level of the line of sight and the level is arranged to be moved vertically as a whole.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT761804X | 1953-04-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB761804A true GB761804A (en) | 1956-11-21 |
Family
ID=11315911
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10233/54A Expired GB761804A (en) | 1953-04-08 | 1954-04-07 | Improvements relating to levels |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB761804A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116678377A (en) * | 2023-08-03 | 2023-09-01 | 中国水利水电第七工程局有限公司 | Tunnel clearance automatic detection method based on automatic total station |
-
1954
- 1954-04-07 GB GB10233/54A patent/GB761804A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116678377A (en) * | 2023-08-03 | 2023-09-01 | 中国水利水电第七工程局有限公司 | Tunnel clearance automatic detection method based on automatic total station |
CN116678377B (en) * | 2023-08-03 | 2023-11-03 | 中国水利水电第七工程局有限公司 | Tunnel clearance automatic detection method based on automatic total station |
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