Evaluation of drilled-ball bearings at DN values to three million. 1: Variable oil flow tests
This is a NASA technical report from 1932 on drilled-ball bearing tests, prepared through the NASA Technical Reports Server for engineers assessing high-speed bearing lubrication. The pictures are black-and-white photographs of bearing rings and balls set against dark backgrounds with measurement rulers, showing wear and drilling detail a designer could use as a reference for mechanical texture and industrial still-life compositions.
