1917 Technical Notes, School of Military Aeronautics, U of Illinois, Paul Mantz-H.Clyde Balsley S2 Tracker Although not specifically labeled

Although not specifically labeled

This device

a single ring with central dot orange reticle

The compass body measures ~4

Bearing Distance Heading

1917 Technical Notes, School of Military Aeronautics, U of Illinois, Paul Mantz-H.Clyde Balsley S2 Tracker Although not specifically labeledThis original, historical document is a collection of Technical Notes assembled by the instructional staff of the School of Military Aeronautics at the University of Illinois in June 1917 for its new curriculum in preparation for America's entry into World War I. This volume was given to air racer and movie stunt pilot Paul Mantz in 1939 by Horace Clyde Balsley. Balsley was one of seven American pilots to join France's Lafayette Escadrille and was the