IN 1911, A British stist named C. T. R. Wilson was studying cloud formations bytramping regularly to the summit of Ben Nevis, a famously damp Scottish mountain, when itoccurred to him that there must be an easier way to study clouds. Ba the dish Labin Cambridge he built an artificial cloud chamber—a simple devi which he could cooland moisten the air, creating a reasonable model of a cloud in laboratory ditions.
The device worked very well, but had an additional, ued be. When heaccelerated an alpha particle through the chamber to seed his make-believe clouds, it left avisible trail—like the trails of a passing airliner. He had just ied the particle detector.
It provided ving evidehat subatomic particles did indeed exist.
Eventually two other dish stists ied a more powerful proton-beam device,while in California Er Lawre Berkeley produced his famous and impressivecyclotron, or atom smasher, as such devices were loingly known. All of thesetraption……（内容加载失败！）
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