Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24, B-17 (B) B-47 Each has a US Navy

Each has a US Navy Pensacola service label from the 1960's

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

but could possibly be repaired

We estimate that it is from 1958/59 since it is labeled "PRELIMINARY PERFORMANCE DATA" and the DC-8 entered service with United Air Lines in 1959

Pilot Director Indicator as used with C-1 Autopilot, WWII B-29, B-24, B-17 (B) B-47 Each has a US NavyThe Pilot Director Indicator (PDI) was used during WWII in bombers of the US Army Air Force, including heavy bombers B 17 Flying Fortress, B 24 Liberator, and B 29 Superfortress and medium bombers B 25 Mitchell and B 26 Marauder, and US Navy's PBY5A Catalina and PB4Y Privateer. The PDI was located on the pilots instrument panel, and received signals from the bombardier to indicate his desired course changes, left or right, to obtain an accurate bomb