Aeronautic Instruments. Section II : Altitude Instruments
This is a 1923 aeronautical technical report, section II on altitude instruments, issued through the NASA Technical Reports Server and drawn from its archive of early aviation research. The four figures show laboratory and field apparatus: a mercury barometer and vacuum control board, a temperature chamber with a motor-driven container, a set of capsules for aneroid testing, and rate-of-climb indicators with their cases. For a designer, the strongest takeaway is the dense, practical engineering layout of brass dials, glass tubes and tubing, shot in plain documentary light.
