GB825228A - Improvements in and relating to navigational calculating instruments - Google Patents
Improvements in and relating to navigational calculating instrumentsInfo
- Publication number
- GB825228A GB825228A GB2740756A GB2740756A GB825228A GB 825228 A GB825228 A GB 825228A GB 2740756 A GB2740756 A GB 2740756A GB 2740756 A GB2740756 A GB 2740756A GB 825228 A GB825228 A GB 825228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scales
- range
- shortest distance
- scale
- marked
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G1/00—Hand manipulated computing devices
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Hardware Design (AREA)
- Displays For Variable Information Using Movable Means (AREA)
Abstract
825,228. Calculating-apparatus. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Sept. 2, 1957 [Sept. 7. 1956], No. 27407/56. Class 106 (1). Calculating apparatus for predicting the shortest future distance between two relatively approaching objects, such as ships, given two successive values R 1 , R 2 of the range of one ship from the other and the corresponding change in bearing a, comprises two relatively movable members, one of which bears a reciprocal scale of range and the other of which bears a set of reciprocal scales graduated according to the shortest distances of approach for different values of the change in bearing. The latter set of scales may be replaced by a set of curves passing through points of equal value on the set of scales. It is shown that, as an approximation, the shortest distance of approach d=sin α/R 2 <SP>-1</SP> - R 1 <SP>-1</SP>) and consequently the shortest distance of approach scales are calibrated to take account of the factor sin a. Then, if R 1 on the range scale is aligned with the datum line from which the other scales are drawn, the required value d may be read on the appropriate shortest distance scale opposite the value R 2 on the range scale. In one embodiment, Fig. 3, the range scale 8a is marked on a stock member 8 and the other scales 9a on a slide 9. Eight scales 9a provide for changes in bearing angle from “‹-2‹ at “‹ intervals. A cursor 10 facilitates reading. In another embodiment, Fig. 1 (not shown), the shortest distance scales are drawn radially on a disc and the range scale is marked on a bar pivoted at the centre but slidable relatively thereto. In this case two alternative range scales are provided and co-operate with alternative sets of shortest distance scales. In another arrangement, Fig. 2 (not shown), the range scale is marked round the periphery of a disc rotatable on a base member in which moves a slide bearing the set of shortest distance scales, in this case arcuate, a selected one of which may be moved into juxtaposition with the range scale. In a fourth embodiment, Fig. 4, curves 11a of equal shortest distance values are marked on a drum or endless band 11 in a casing 15 having a window 15a through which the change in bearing value corresponding to the portion of the curves visible through a window 15b may be read. The range scale is marked on an endless band adjustable by a knob 14a and also passing across the window 15b.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2740756A GB825228A (en) | 1956-09-07 | 1956-09-07 | Improvements in and relating to navigational calculating instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2740756A GB825228A (en) | 1956-09-07 | 1956-09-07 | Improvements in and relating to navigational calculating instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB825228A true GB825228A (en) | 1959-12-09 |
Family
ID=10259070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2740756A Expired GB825228A (en) | 1956-09-07 | 1956-09-07 | Improvements in and relating to navigational calculating instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB825228A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2707257A1 (en) * | 1977-02-19 | 1978-08-24 | Eberhard Goernemann | Navigational aid for ships for avoidance of collisions - has movable information carrier with indications for position recognition and avoidance action decision |
CN104422438B (en) * | 2013-08-20 | 2018-05-11 | ***通信集团公司 | Air navigation aid, system and equipment |
-
1956
- 1956-09-07 GB GB2740756A patent/GB825228A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2707257A1 (en) * | 1977-02-19 | 1978-08-24 | Eberhard Goernemann | Navigational aid for ships for avoidance of collisions - has movable information carrier with indications for position recognition and avoidance action decision |
CN104422438B (en) * | 2013-08-20 | 2018-05-11 | ***通信集团公司 | Air navigation aid, system and equipment |
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