The Increase in Frictional Resistance Caused by Various Types of Rivet Heads as Determined by Tests of Planing Surfaces
This is a 1938 NACA technical report, issued by the National Advisory Committee for Aeronautics, on how different rivet head shapes add to skin-friction drag, tested on planing surfaces. Its pages show test plates and photographs of riveted panels with figure captions, aimed at aeronautical engineers. A designer might take from it the visual language of engineering test documentation: a flat, grey, evenly lit plate photographed straight on, with rows of rivet heads set in precise grids that read as clean repeating texture.
