Aeronautic Instruments. Section VI : Aerial Navigation and Navigating Instruments
A 1923 technical section on aerial navigation and navigating instruments, issued by NASA's Technical Reports Server from a government aeronautics series for aviators and instrument makers. Its pictures show diagrams of heading, air speed and ground speed vectors, a round calculating disc, and plotting instruments laid over a chart, offering a designer clear geometric diagrams and precise mechanical forms to borrow.
