GB560952A - Improvements in apparatus for graphical computation for the solution of navigation problems and similar problems - Google Patents
Improvements in apparatus for graphical computation for the solution of navigation problems and similar problemsInfo
- Publication number
- GB560952A GB560952A GB7483/42A GB748342A GB560952A GB 560952 A GB560952 A GB 560952A GB 7483/42 A GB7483/42 A GB 7483/42A GB 748342 A GB748342 A GB 748342A GB 560952 A GB560952 A GB 560952A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chart
- projection
- distance
- plotting
- contact
- 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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G1/00—Hand manipulated computing devices
- G06G1/14—Hand manipulated computing devices in which a straight or curved line has to be drawn from given points on one or more input scales to one or more points on a result scale
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
560,952. Calculating- apparatus. BYERLY, R. W. June 2, 1942, No. 7483. Convention date, June 27, 1941. [Class 106 (i)] Apparatus for graphically solving navigational problems for obtaining the great circle distance between two points on a spherical surface comprises a chart bearing a gnomonic projection and an element pivoted on the chart at the point of contact of the said projection on which can be plotted the data to set off a line of position. In the form shown in Fig. 1, the chart A bears great circle projections of the parallels and meridians of a sphere with the contact point at the equator and the plotting element is formed as a transparent sheet 10 with a roughened surface to facilitate marking. After numbering the meridians with the desired graduations the position C1 of an observed celestial body and the dead-reckoning position S1 are marked on the transparent sheet. The sheet is then swung round the pivot until the line C1-S lies on, or is parallel to, a common meridian as shown at C<1>1-S<1>1. The latitude of these points are read off and the algebraic difference gives the great circle distance which is the zenith distance of the celestial body. By comparing the calculated distance with the observed zenith distance, the off-set of the line of position from the dead-reckoning position is obtained. In a modification, the chart is divided into two halves ; the plotting half bears a projection with the contact point at a pole, while the measuring half has a projection with the contact point at the centre. In another form, the chart has the point of contact on an intermediate parallel of latitude. Instead of a transparent sheet, other types of elements for plotting the data may be used. These elements may comprise slidable and pivoted rules.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US560952XA | 1941-06-27 | 1941-06-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB560952A true GB560952A (en) | 1944-04-28 |
Family
ID=22002111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7483/42A Expired GB560952A (en) | 1941-06-27 | 1942-06-02 | Improvements in apparatus for graphical computation for the solution of navigation problems and similar problems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB560952A (en) |
-
1942
- 1942-06-02 GB GB7483/42A patent/GB560952A/en not_active Expired
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