The heat transfer of cooling fins on moving air
A 1935 NASA technical report on heat transfer from cooling fins in moving air, presented as graphs and diagrams for engineers studying fin performance. The pictures are plain line charts of temperature ratios against distance and velocity, with curves labelled by air speed, and contour plots of velocity and temperature fields across a channel. A designer could take from them the clean monochrome chart conventions, labelled curve families, and the layered contour-line treatment of flow fields as a visual vocabulary for technical diagrams.
