Automatic Stabilization
A 1936 technical report on automatic stabilization of aircraft, published by NASA's Technical Reports Server but originally issued as an engineering document for aeronautical engineers and designers of flight control systems. The pictures are mechanical line diagrams and schematics of gyroscope-driven servo linkages, pneumatic and oil-pressure actuators, and cable runs to aileron and elevator surfaces, drawn in clean black ink on pale paper. A designer might take from them the sparse, labelled diagram style of mid-century engineering drawings, with arrows, axis triads and hatched housings.
