Precipitation Static, USAAF Manual No. 10 Dec 1944 SBD Dauntless They were essentially timers for

They were essentially timers for communications radios that broadcast a fourteen second carrier wave every minute

The first 40 pages describe the Ground Observer Corps and its responsibilities

The wooden case measures 12in wide x 9in deep x 8in high

The APA-44 was under development in 1945 and ultimately became a prime component of three bombing-navigation systems

All pages appear to be intact

Precipitation Static, USAAF Manual No. 10 Dec 1944 SBD Dauntless They were essentially timers forThis is an original training manual covering the topic of Precipitation Static published by the US Army Air Corps in 1944 for use in training pilots. The manual discusses the build up of static charge on the aircraft in flight during different atmospheric conditions and how this affects radio receiving equipment. This 36 page manual is in good condition given its age. It came to us from the estate of a B 17 flight instructor.