Mufflers for aeronautic engines
A 1917 technical report from the NASA Technical Reports Server, originally issued for aeronautic engine designers, that sets out the construction of mufflers for aircraft engines through dimensioned drawings. The three pictures are engineering line drawings of cylindrical muffler bodies with perforated inner tubes, conical expansion chambers, and wire-screen baffle stages, labelled with lengths in inches, hole patterns and mesh counts; a designer could take from them the logic of stacked chambers and graded perforation for quieting exhaust noise.
