The N.A.C.A. Combustion Chamber Gas-sampling Valve and Some Preliminary Test Results
A 1933 NACA technical note on a combustion chamber gas-sampling valve, issued by the National Advisory Committee for Aeronautics for engine researchers. The pictures are plain black-and-white photographs of test rigs, an engine installation and the valve in assembled and disassembled states, with numbered figure captions. A designer could take from them the precise, exploded-view presentation of mechanical parts and the cluttered look of early laboratory engine test apparatus.
