Rate-of-climb Recorder
A 1938 NASA Technical Reports Server report on a rate-of-climb recorder, an aircraft instrument for logging how fast a plane gains or loses altitude. Its pictures are technical figures: hand-drawn trace charts of climb rate and altimeter records, and a photographed control panel with labelled tubes, gauges and fittings. A designer might take from them the clean line-graph style of recorded data and the dense, functional layout of early aviation instrument panels.
