An extensive ruler used as a computer in navigation to calculate travel time between map points or to calculate ground speed is described. The ruler has a time scale that can be adjusted at length to equal map distances travelled at a designated speed in a time period such as sixty minutes. A means for fixing the length of the ruler is also provided.
Ruler for making navigational computations
1966-01-18
Miscellaneous
No indication
English
Engineering Index Backfile | 1961
|Springer Verlag | 2018
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