GB153989A - Device for indicating the direction and speed of movement of air-craft relatively to the ground - Google Patents
Device for indicating the direction and speed of movement of air-craft relatively to the groundInfo
- Publication number
- GB153989A GB153989A GB2144019A GB2144019A GB153989A GB 153989 A GB153989 A GB 153989A GB 2144019 A GB2144019 A GB 2144019A GB 2144019 A GB2144019 A GB 2144019A GB 153989 A GB153989 A GB 153989A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sighting
- strip
- ground
- aperture
- housing
- 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
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
153,989. Greathead, W. R. Sept. 1, 1919. Speed measurement by sighting terrestrial objects.-In an instrument for use on aircraft for determining the ground speed, and of the kind in which a perforated or transparent strip is caused to travel, with reference to a sighting-aperture, at the same apparent speed as objects on the ground, the distance between the strip and the sighting aperture is adjustable. The slotted strip 7 is wound on spools 10 in a housing 13 and is uniformly moved by a sprocket 11 actuated by clockwork 12. The housing 13 is mounted on a casing 6 having the sighting-aperture 9 at its upper end, and can be racked vertically by the handwheel 14, the distance of the housing from the sighting-aperture being indicated on a scale 15. The casing 6 is mounted on an externallytoothed carrier 2 which can be rotated by the pinion 4 until objects on the ground appear to move in the same direction as the strip. The angle of drift is then indicated on a scale 5. To enable the strip to be moved at different uniform speeds either the housing 13 or the clockwork 12 may be removed and replaced by a different one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2144019A GB153989A (en) | 1919-09-01 | 1919-09-01 | Device for indicating the direction and speed of movement of air-craft relatively to the ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2144019A GB153989A (en) | 1919-09-01 | 1919-09-01 | Device for indicating the direction and speed of movement of air-craft relatively to the ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB153989A true GB153989A (en) | 1920-11-25 |
Family
ID=10162978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2144019A Expired GB153989A (en) | 1919-09-01 | 1919-09-01 | Device for indicating the direction and speed of movement of air-craft relatively to the ground |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB153989A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2505624A (en) * | 1945-08-01 | 1950-04-25 | Emmett T Molamphy | Navigation instrument |
-
1919
- 1919-09-01 GB GB2144019A patent/GB153989A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2505624A (en) * | 1945-08-01 | 1950-04-25 | Emmett T Molamphy | Navigation instrument |
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