THE problem of accurately calculating the actual altitude reached in the course of a record attempt was for long solved by direct reading of the diagrammatic curve of a recording altimeter. This elementary procedure was considered satisfactory before the War at a time when high altitude flying remained an exception and the physical properties of the upper air had not been the subject of extensive scientific research.
de Marolles, R.J. (1936), "Altitude Record Flights: The New F.A.I. Regulations Explained, with a Description of the French Potez 50", Aircraft Engineering and Aerospace Technology, Vol. 8 No. 11, pp. 299-301. https://doi.org/10.1108/eb030111
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