NASA NTRS · 19780009088
Ruler for making navigational computations
Abstract
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.
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Holmes, L., Jr.. 1966-01-18. Ruler for making navigational computations. https://ntrs.nasa.gov/citations/19780009088
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