GB835810A - Improvements in or relating to pendulum devices - Google Patents
Improvements in or relating to pendulum devicesInfo
- Publication number
- GB835810A GB835810A GB2675657A GB2675657A GB835810A GB 835810 A GB835810 A GB 835810A GB 2675657 A GB2675657 A GB 2675657A GB 2675657 A GB2675657 A GB 2675657A GB 835810 A GB835810 A GB 835810A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bob
- elements
- level
- spring
- disposed
- 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
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/12—Measuring inclination, e.g. by clinometers, by levels by using a single pendulum plumb lines G01C15/10
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
- G02B27/648—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake for automatically maintaining a reference alignment, e.g. in self-levelling surveying instruments
Abstract
835,810. Optical systems; levels, theodolites. THOMPSON, E. H. Aug. 14, 1958 [Aug. 23, 1957], No. 26756/57. Classes 97(1) and 97(2) A pendulum device for supporting a graticule or other reference member and/ or for supporting other parts of the optical system of an instrument, such as a level or a theodolite, comprises a tiltable body C, having a portion of constant radius and a bob E disposed beneath the tiltable body and secured thereto by a spring member D, part of which is vertically disposed. In another form, Fig. 1, the tiltable body comprises coaxial cylindrical elements 5, and a cylindrical element 6, which, when the body is viewed in elevation appears to intersect the elements 5 or to be tangential thereto Spring straps 3 connect the elements 5 to one end of a bob 2, and spring straps 4 connect the element 6 to other end of the bob 2. When the body is untilted, the axes of the cylindrical elements lie in a common horizontal plane, and all the spring straps are tangential to their respective elements at a common point of intersection, or at the point of tangency, vertically above the centre of gravity of the bob. The pendulum device may be incorporated in a sighting level, in which case the bob has secured thereto a frame F, Fig. 5, carrying a mirror M2 and a graticule G disposed in the light path through the level, which is provided also with an objective O, a mirror M1 and an eyepiece E, connected, like the'body B, to the instrument so as to tilt therewith. Alternatively, the bob may comprise a pivoted arm A having pointers P1, P2 for reading the vertical circle C of a theodolite, Fig. 6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2675657A GB835810A (en) | 1957-08-23 | 1957-08-23 | Improvements in or relating to pendulum devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2675657A GB835810A (en) | 1957-08-23 | 1957-08-23 | Improvements in or relating to pendulum devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB835810A true GB835810A (en) | 1960-05-25 |
Family
ID=10248713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2675657A Expired GB835810A (en) | 1957-08-23 | 1957-08-23 | Improvements in or relating to pendulum devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB835810A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006019412A1 (en) * | 2004-07-19 | 2006-02-23 | Trimble Navigation Limited | Self-leveling laser aligment tool and method with compensation for stiffness of pendulum suspension |
WO2006044022A1 (en) * | 2004-10-19 | 2006-04-27 | Trimble Navigation Limited | Self-leveling laser alignment tool and method thereof |
-
1957
- 1957-08-23 GB GB2675657A patent/GB835810A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006019412A1 (en) * | 2004-07-19 | 2006-02-23 | Trimble Navigation Limited | Self-leveling laser aligment tool and method with compensation for stiffness of pendulum suspension |
US7032318B2 (en) | 2004-07-19 | 2006-04-25 | Trimble Navigation Limited | Self-leveling laser alignment tool and method thereof which compensates for material stiffness of an included pendulum |
WO2006044022A1 (en) * | 2004-10-19 | 2006-04-27 | Trimble Navigation Limited | Self-leveling laser alignment tool and method thereof |
US7073269B2 (en) | 2004-10-19 | 2006-07-11 | Trimble Navigation Limited | Self-leveling laser alignment tool and method thereof |
CN100575875C (en) * | 2004-10-19 | 2009-12-30 | 天宝导航有限公司 | Self-level(l)ing laser alignment tool and method thereof |
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