Through The Overcast: The Weather and the Art of Instrument Flying, by Assen Jordanoff F9F Cougar This magnetic compass

This magnetic compass

is "AF US Army"

this is essentially the radar scope lens for the AN/APG-33 and -40 Radar Systems of the E-1 Fire Control System developed by Hughes Aircraft for the US Air Force

Hydrostatic fuel quantity indicators are readily identifiable by the pump knob at their base

It also has a service label dated June 8

Through The Overcast: The Weather and the Art of Instrument Flying, by Assen Jordanoff F9F Cougar This magnetic compassThrough the Overcast, originally published in 1938 (this edition 1943). This 356 page book covers all that was known and deemed important at the time regarding flight by instruments. The book is in good condition given its age.