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The four-minute warning was a public alert system conceived by the British Government during the Cold War and operated between 1953 and 1992. The name derived from the approximate length of time from the point at which a Soviet nuclear missile attack against the United Kingdom could be confirmed and the impact of those missiles on their targets.
A time bomb's timing mechanism may be professionally manufactured either separately or as part of the device, or it may be improvised from an ordinary household timer such as a wind-up alarm clock, wrist watch, digital kitchen timer, or notebook computer. The timer can be programmed to count up or count down (usually the latter; as the bomb ...
Nuclear bomb designed to fit inside a suitcase. 1950s Thermometric bomb: Also called a vacuum bomb, or aerosol bomb, this explosive disperses a cloud of gas or liquid. Time bomb: A bomb that is triggered by the timer. Trinitrotoluene: Commonly known as TNT. 1863 Julius Wilbrand: Germany: Unguided bomb: An air-craft dropped bomb that lacks a ...
An accurate rule of thumb, applicable in the time-period of days to a few weeks post-detonation which approximates the radioactive dose rate generated by the decay of the myriad of isotopes present in nuclear fallout, is the "7/10 rule". [133] [105] The rule states that for each 7-fold increase in time the dose rate drops by a factor of 10. [134]
A CBU-100 Rockeye deployed by an A-4 Skyhawk that opens immediately after deployment drops 247 bomblets. The CBUs are delivered to the fleet as completely assembled all-up-rounds. The cargo section of the Rockeye's Mk 7 bomb dispenser is the main structure of the weapon and contains the bombs/bomblets.
A pencil detonator or time pencil is a time fuze designed to be connected to a detonator or short length of safety fuse. They are about the same size and shape as a pencil , hence the name. They were introduced during World War II and developed at Aston House , Hertfordshire , UK .
A delay-action bomb is an aerial bomb designed to explode some time after impact, with the bomb's fuzes set to delay the explosion for times ranging from very brief to several weeks. Short delays are used to allow the bomb to penetrate before exploding: "a delay action bomb striking the roof of a tall building will penetrate through several ...