The Altitude Effect on Air Speed Indicators
This is a 1921 technical report from NASA's Technical Reports Server on how altitude affects air speed indicators, written for aeronautical engineers and researchers. The pictures are plain engineering line graphs of pressure coefficients against Reynolds-type values for German, French, and US pitot-venturi tubes, plus a schematic of a vacuum wind tunnel with manometers and a blower. A designer could take their clean grid layouts, sparse curve plotting, and labelled schematic diagram style as a model for technical data visualisation.
