Tests of several bearing materials lubricated by gasoline
This is a 1926 NACA technical note from the NASA Technical Reports Server, reporting bearing material tests lubricated with gasoline, written for aeronautical engineers. The first picture is a labelled diagrammatic sketch of a bearing test apparatus with a test shaft, test bearings, a balance weight and bushing and half-bearing detail views, and the second is a line graph of load against wear rate for several bearing materials. A designer could take from them a precise, schematic drafting style with clean leader lines, lettered callouts and a plain black-on-white grid suited to technical diagrams.
