In the Brownsville warhead signals from both radar and air pressure sensors prompt an electronics package to begin detonation: time is now measured in microseconds--millionths of a second. An electrical impulse is sent and divided to travel down 60 different wires to the "primary". After 0.003 microseconds these impulses each reach a pair of detonators, positioned at sixty points on a hollow sphere of high explosives. The explosives begin to detonate radially from each detonator. The high explosive sphere is a mixture of curved shapes of two different types of explosives so that the sixty separate explosions converge into a perfectly spherical explosive wave travelling inward--with the force of a third of a ton of dynamite. After 10 microse
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