Flight Tests on Airplanes
This is a 1926 NACA technical memorandum on airplane flight testing, issued by the National Advisory Committee for Aeronautics for engineers and aviation researchers. Its plates are mostly photographs of test instruments, aircraft components and recording traces, with a few line diagrams of a graduated sheet and measurement curves. A designer could take from them the stark, functional look of early aeronautical engineering documentation: grainy sepia photographs, plain numbered figure captions and clean technical line drawings.
