Aircraft Instruments and Their Maintenance Course Book, 1941 Sunderland The knob is used to

The knob is used to set the dial to match engine RPM

with a year of manufacture of 1945

Protection for the airplane against damage from its guns

slips into the frame on the front of the panel

Here is an instrument that you've probably not seen before

Aircraft Instruments and Their Maintenance Course Book, 1941 Sunderland The knob is used toThis 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