Scope and Contents: Products series is divided into eleven subseries: Aeronautical Systems; Air armament; Aircraft sights and turrets; Army Fire Control (AFC), Bomber Navigation Systems (BNS); Marine systems; Microwave and electronic equipment; Navy Fire Control (NFC) and Navy systems; Radio and electronics; Surface armament; and Searchlights.Throughout the subseries many folders are titled with “AN/” followed by a series of letters and numbers. The United States military use letter combinations to designate electronic and communications equipment. This designation system is called the "Joint Communications-Electronics Nomenclature System" or “AN” for short (Army-Navy). All designations have the “AN/” prefix followed by three letters, a number, and potentially followed by another single letter and a version. The letters in different positions signify the installation, equipment type, and purpose. See the Wikipedia entry for Joint Communications-Electronics Nomenclature System for the full explanation of the letters in the system. Aeronautical systems subseries are images of parts and components for aircraft related to autopilots, gyros, and navigation. There are many folders containing images of products from various Sperry departments. Departments were assigned numbers, however, there is no key within the collection that explains what the numbers mean or what the name of the department was. The images date from 1912 to 1918 and from 1926 to 1964. The films in this subseries are primarily of flight tests, there are a few films not produced by Sperry that show old versus new methods of manufacturing or installing different parts, and there is a three part series about weighted guidelines.Air Armament subseries are images of components primarily related to radar. There are also images of parts, components and the production of aircraft bombers Hustler B-58 and Tempo I, and the air-to-air guided missile, the Sparrow. The images date from 1948 to 1962. There is one film showing various tests of targeting by air.Aircraft sights and turrets subseries contains images of bombsights, gunsights and turrets. The images date from 1916 to 1947. There are many films showing tests of gunsights, particularly the Airborne Gunlaying System (AGL). There are also films showing various turret experiments, specifically with the Central Station...