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A British air raid siren from the Second World War. All clear is the signal, generally given by an air raid siren, which indicates that an air raid or other hazard has finished and that it is safe for civilians to leave their shelters; it is commonly used in radios as well.
Air Raid Precautions (ARP) refers to a number of organisations and guidelines in the United Kingdom dedicated to the protection of civilians from the danger of air raids. Government consideration for air raid precautions increased in the 1920s and 30s, with the Raid Wardens' Service set up in 1937 to report on bombing incidents. [ 1 ]
An Air raid shelter in the city seen in 2010 Hull's first air-raid warning was at 02:45 on Monday 4 September 1939: as an 'air-raid yellow' all operational crews were called to their posts. The public siren sounded at 03:20 and the all-clear at 04:08.
The Aircraft Warning Service (AWS) was a civilian service of the United States Army Ground Observer Corps instated during World War II to keep watch for enemy planes entering American airspace. It became inactive on May 29, 1944.
Here they were caught by the second raid, which started without an air-raid warning, at 1:22 a.m. [87] At 11:30 a.m., the third wave of bombers, the two hundred and eleven American Flying Fortresses, began their attack. Over ninety per cent of the city centre was destroyed. To my left I suddenly see a woman.
Toyama burns after a B-29 air raid, 1 August 1945. August 1945 began with further large-scale raids against Japanese cities. On the 1st of the month, 836 B-29s staged the largest single raid of World War II, dropping 6,145 tons of bombs and mines.
A complete set of air raid alarms. The air raid warning comes in three types: [21] Pre-raid warning: a 36-second high tone followed by a 24-second low tone, with three cycles per period. This warning signifies an air raid is likely about to take place. Raid warning: a six-second high-tone followed by a six-second low tone, with 15 cycles per ...
Acting upon advice from Brownell, the commanding officer of III Corps, Lieutenant General Gordon Bennett, ordered an air raid warning for Fremantle and Perth. This led to No. 85 Squadron being readied, air raid sirens being sounded, air raid wardens taking their posts, and the evacuation of hospitals. No raid eventuated and the "all clear ...