The Elimination of Fire Hazard Due to Back Fires
A 1933 technical report from the NASA Technical Reports Server, a government aeronautical research document on preventing fire from back-fires in engines, illustrated with photographs of test apparatus. The pictures show a metal flame-arrestor tube fitted with thermocouple leads, a spark plug and sight holes, and a cylindrical plate-type flame arrestor beside a steel ruler, giving a designer plain engineering photographs of machined metal parts with precise scale references.
