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密立根油滴实验是物理学近代史上直接测定电子电荷的一个著名实验。我国从1984年开始使用的高中物理甲种本第二册中也编入这个实验——基本电荷的测定:密立根实验。为了满足这一实验的需要,由国家教委教学仪器研究所与福建师大光仪厂联合研制了J2438型密立根油滴实验仪。
The Milligan Oil Drop Experiment is a well-known experiment that directly measures the electronic charge in the history of physics. This experiment was also included in the second volume of high school physics that was used in China since 1984. The determination of the basic charge is the Millikan experiment. In order to meet the needs of this experiment, the J2438 Millikan Oil Drop Tester was jointly developed by the National Institute of Education Teaching Instrument Research Institute and Fujian Normal University Guangyi Factory.