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An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.
The Potez-CAMS 141 was designed by Chantiers Aéro-Maritimes de la Seine (or CAMS, which since 1933 had been part of Potez) to meet a 1935 French Navy specification for a long range marine reconnaissance flying boat to replace obsolete aircraft such as the Breguet Bizerte, competing against the Latécoère 611 and Breguet 730.
In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones.
A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
The AN/PAS-13B thermal weapon sight (TWS) is an infrared sight developed for the United States military by Raytheon. The sight is designed for use on small arms in the U.S. military's inventory, but it can also be used as a standalone observation device. The AN/PAS-13B uses thermal imaging so that it can be used day or night. Thermal imaging ...
Torpedo boat (fast attack craft) Displacement: 183.4 tonnes standard, 210 tonnes full load: Length: 42.6 m (139 ft 9 in) Beam: 7.1 m (23 ft 4 in) Draught: 2.3 m (7 ft 7 in) Propulsion: 4 Maybach MD 871 diesel engines, 3000 PS each (replaced by MD 872 engines with 3600 PS in the late 1960s)
The boats were commissioned into the Bundesmarine in the mid-1970s, replacing the Jaguar-class vessels of the 3rd and 5th Squadrons. At first the boats did not receive names, only numbers, but these were introduced later at the insistence of the crews. The ships served for 30 years, and received major updates in 1982–84 and 1990–92.
The first torpedo-boat to serve with the United States Navy was the experimental Stiletto of 31 tons, built in 1885-86 as a yacht by the Herreschoff Manufacturing Company, Bristol, Rhode Island. Designated WTB-1 (for "Wooden Torpedo Boat"), she was purchased under the Act of 3 March 1887 for use as a torpedo boat for experimental purposes and ...