GB556034A - Improvements in or relating to sextants - Google Patents
Improvements in or relating to sextantsInfo
- Publication number
- GB556034A GB556034A GB916842A GB916842A GB556034A GB 556034 A GB556034 A GB 556034A GB 916842 A GB916842 A GB 916842A GB 916842 A GB916842 A GB 916842A GB 556034 A GB556034 A GB 556034A
- Authority
- GB
- United Kingdom
- Prior art keywords
- worm
- housing
- spring
- shackman
- arc
- 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
- G01C1/00—Measuring angles
- G01C1/08—Sextants
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Gears, Cams (AREA)
- Adjustable Resistors (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
556,034. Sextants. SHACKMAN, A., and SHACKMAN, R. C. July 2, 1942, No. 9168. [Class 97 (ii)] A sextant comprises an arc 1 having worm threads on its periphery, an index arm 7, a housing 5 pivotally supported on the index arm, a shaft 19 extending into the housing, a micrometer drum 17 mounted on the shaft exteriorly of the housing, a worm 4 of a diameter approximating to the diameter of the micrometer drum, a spring 12 normally urging the housing towards the arc to engage the worm, and means (a thumb piece 15) for pivotally moving the housing against the action of the spring to disengage the worm and permit coarse adjustment. The worm 4 is rotated by a knurled member 18. The worm spindle 19 is maintained in true axial alignment by a conical collar 20 pressed against a conical seating by spring-loaded pivots 23.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB916842A GB556034A (en) | 1942-07-02 | 1942-07-02 | Improvements in or relating to sextants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB916842A GB556034A (en) | 1942-07-02 | 1942-07-02 | Improvements in or relating to sextants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB556034A true GB556034A (en) | 1943-09-16 |
Family
ID=9866711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB916842A Expired GB556034A (en) | 1942-07-02 | 1942-07-02 | Improvements in or relating to sextants |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB556034A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2504960A (en) * | 1946-12-10 | 1950-04-25 | Thomas O Brandon | Bearing structure for sextants or the like |
| US4707926A (en) * | 1984-03-16 | 1987-11-24 | Kuau Technology, Ltd. | Automatic sextant |
| US4763418A (en) * | 1984-03-16 | 1988-08-16 | Kuau Technology, Ltd. | Automatic sextant |
| US5044086A (en) * | 1988-01-20 | 1991-09-03 | C. Plath | Drum screw with measuring drum for a sextant |
| US5159401A (en) * | 1990-09-06 | 1992-10-27 | Decker Jr John A | Elevation-angle sensing, celestial navigation and surveying |
-
1942
- 1942-07-02 GB GB916842A patent/GB556034A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2504960A (en) * | 1946-12-10 | 1950-04-25 | Thomas O Brandon | Bearing structure for sextants or the like |
| US4707926A (en) * | 1984-03-16 | 1987-11-24 | Kuau Technology, Ltd. | Automatic sextant |
| US4763418A (en) * | 1984-03-16 | 1988-08-16 | Kuau Technology, Ltd. | Automatic sextant |
| US5044086A (en) * | 1988-01-20 | 1991-09-03 | C. Plath | Drum screw with measuring drum for a sextant |
| US5159401A (en) * | 1990-09-06 | 1992-10-27 | Decker Jr John A | Elevation-angle sensing, celestial navigation and surveying |
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