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A coilgun (or Gauss gun, in reference to Carl Friedrich Gauss, who formulated mathematical descriptions of the magnetic effect used by magnetic accelerators) is a type of projectile accelerator consisting of one or more coils used as electromagnets in the configuration of a linear motor that accelerate a ferromagnetic or conducting projectile to high velocity.[1] In almost all coilgun configurations, the coils and the gun barrel are arranged on a common axis. Coilguns generally consist of one or more coils arranged along a barrel, so the path of the accelerating projectile lies along the central axis of the coils. The coils are switched on and off in a precisely timed sequence, causing the projectile to be accelerated quickly along the barrel via magnetic forces. Coilgun Coilgun
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Background: This floating bridge, which was completed in 1966, carries State Route 520 from Seattle to Medina, Washington. At 1.4 miles long, it has one of the longest floating spans in the world. Why It's Innovative: Because Lake Washington can be more than 200 feet deep, building a suspension bridge across it was not a viable option in the 1960s. The floating design, which relies on concrete pontoons that are anchored by underwater weights, was the perfect solution. In its more than 40 years of existence, the Evergreen Point Floating Bridge has been battered by high-speed winds and even withstood a barge crashing into it. The World's 18 Strangest Bridges: Gallery The World's 18 Strangest Bridges: Gallery