Radar Indicator Lens, AN/APG-33 and-40 Radar for E-1 Fire Control System

While called a "Flight Indicator" on its label, 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. These systems were put into use on the Northrup F-89 Scorpion and Lockheed F-94 Starfire Fighter/Interceptors in the 1950's.  See images of the scope on the F-94 and the F-89 (instrument panel from the F-89 flight manual). Made by Hughes Aircraft, part number 435-62-0001. This has also been observed on the Canadian Avro CF-100 Canuck (see cockpit image). The E-1 fire control system used the APG-33 or -40 radar to continuously measure the range, azimuth and elevation of the identified target and allow the observer to take control if the “blip” was identified as unfriendly. As found AlternateWars.com: "Produced by the Hughes Aircraft Company, the E-1 was the first in the E series of sophisticated fire-control systems that were to equip more modern planes. The Air Force ordered the