Protection of wooden airplane parts against moisture by means of varnish
A 1926 technical report from the NASA Technical Reports Server, originally issued as an aeronautical study on protecting wooden airplane parts from moisture with varnish and lacquer coatings. Its four pictures are graphs plotting weight change of coated wood against time and against exposure to humid or saturated air. Designers might take the plain line-chart style, with hatched comparison zones and direct labels on curves, as a model for presenting measured test data clearly.
