NASA NTRS · 19930087102
The "navigraph"
Abstract
Commander Le Prieur, whose flight experience in a low-speed seaplane we related in our number of September 27, 1924, invented, four years ago, an instrument destined to render very great service to aviators, namely, the "navigraph", designed to correct errors of orientation due to the effect of the winds during flight.
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Le Prieur, Ives. 1925-06-01. The "navigraph". https://ntrs.nasa.gov/citations/19930087102
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