The British tested their ASDIC on HMS Antrim in 1920 and started production in 1922. The 6th Destroyer Flotilla had ASDIC-equipped vessels in 1923. An...

Asdic was the British version of sonar developed at the end of World War I based on the work of French physicist Paul Langevin and Russian engineer M...

Walker. The problem addressed by Walker in the tactics then in use was that ASDIC, the active sonar means to search for and find a submerged submarine, searched...

reflection of ASDIC. The coating reduced echoes by 15% in the 10 to 18 kHz range. This frequency range matched the operating range of the early ASDIC active...

and anti-aircraft weaponry reinforced, while new technologies, such as ASDIC, Huff-Duff and hydrophones, were developed. At the start of World War II...

weapon in the war. The Fairlie Mortar was developed by the Royal Navy's ASDIC-research establishment at Fairlie, North Ayrshire. The research establishment...

with ASDIC were usually conducted in ideal conditions and the British admiralty failed to appreciate the limitations of ASDIC: range was limited, ASDIC worked...

war, an arms race evolved between the Allies and the Kriegsmarine. Sonar (ASDIC in Britain) allowed Allied warships to detect submerged U-boats, but was...

(98 ft). The device lasted 20 to 25 minutes. It replicated the echo of an Asdic-sonar submarine contact. The Royal Navy called it SBT (Submarine Bubble...

required for anti-submarine warfare. Submarines were slow while submerged, and ASDIC sets did not operate effectively at speeds of over 20 knots (23 mph; 37 km/h)...