Spark Plug Defects and Tests
This is a 1920 technical report on spark plug defects and testing, issued by the National Advisory Committee for Aeronautics and held in the NASA Technical Reports Server. It is aimed at engineers and aircraft engine testers. The pictures are engineering line drawings of plug cross-sections, numbered photographs of plug types, a test apparatus diagram, and graphs of gas leakage against pressure, giving a designer clean technical diagrams with strong contrast and dense hatching.
