Aircraft Instruments and Their Maintenance Course Book, 1941

This is an original course book from the American School of Aircraft Instruments. The massive, 2-inch thick book includes 25 lessons covering all aspects of aviation instruments known in 1941.  It addresses theory of operation (when necessary), construction, servicing, and maintenance of all types of instruments in use at the time. Includes text, diagrams, illustrations, and tables.  The course material was prepared in cooperation with the leading instrument manufacturers of the time, including Sperry, Kollsman, and Pioneer.

It is in good condition given its age.