Aeronautic Instruments. Section IV : Direction Instruments
A 1923 technical report from the NASA Technical Reports Server, part of a series on aeronautic instruments, presenting direction-finding instruments for aircraft navigation. Its pictures are black-and-white photographs of compasses and gyroscopic direction devices shown individually against plain backgrounds, with some plates labelled with reference letters. A designer might take from them the clean, mechanical look of early aviation instrument design, with dials, gimbal rings and compass cards.
