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A guard tower is any military tower used for guarding an area. These towers are usually operated by military personnel, and are structures built in areas of established control. These include military bases and cities occupied by military forces. This type of fortification is a variation on the tower incorporated into the walls of castles from ...
Tower house. The Tower of Hallbar in South Lanarkshire, Scotland, UK. A tower house is a particular type of stone structure, built for defensive purposes as well as habitation. [1] Tower houses began to appear in the Middle Ages, especially in mountainous or limited access areas, to command and defend strategic points with reduced forces.
Collimators used to record gamma rays and neutrons from a nuclear test. In X-ray optics, gamma ray optics, and neutron optics, a collimator is a device that filters a stream of rays so that only those traveling parallel to a specified direction are allowed through. Collimators are used for X-ray, gamma-ray, and neutron imaging because it is ...
Control tower and Terminals 3 and 2 seen from ATS (Airport Transit System) In 2018, the city and airlines committed to Phase I of a new Terminal Area Plan dubbed O'Hare 21. The plan was to build two all-new satellite concourses to the southwest of Concourse C, and to expand Terminals 2 and 5 with additional gates, lounges, and updates to ...
Over the next year, the airport started to come together: the dirt runway was replaced with an all-weather surface and more hangars, a restaurant, and a control tower were built. On June 7, 1930, the facility was dedicated and renamed Los Angeles Municipal Airport. Los Angeles Municipal Airport on Army Day, c. 1931
Remote radio head. A remote radio head (RRH), also called a remote radio unit (RRU) in wireless networks, is a remote radio transceiver that connects to an operator radio control panel via electrical or wireless interface. When used to describe aircraft radio cockpit radio systems, the control panel is often called the radio head .
1: Tube connecting the chamber to the high water side of the sluice. 2: Gates to regulate the water level in the chamber. Only one gate may be opened at a time. 3: Tube connecting the chamber to the low water side of the sluice. 4: The chamber in which the water level can be controlled.