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一、關於電力線的演示實驗 1953年7月號物理通報介紹了一篇關於電力線的演示實驗的文章。我們認為那個實驗(將細小的石膏晶體撤在上面贴着兩塊可使其帶電的錫箔的玻璃板上)基本上能够說明電場中的電力線問題,使同學能够看得清楚。以前我們也是這樣做的。但是,這個實驗的缺點在於它只能讓我們看到平面的而不能看到立體的圖形,這對同學是不方便的。按照東北人民教育部編譯的高級中學教科書物理學所指出的實驗電力線的方法可以克服這個缺點。課本上的作法是把奎寧粉或石棉屑混合在凡士林或蓖麻油中,然後持入電場內,即可看出結果。但是我們手頭沒奎寧粉或石棉屑、因此就選取了鋸木
First, on the power line demonstration experiment July 1953 Physics Bulletin introduced an article on the power line demonstration experiment. We think that experiment (pulling small gypsum crystals on glass plates with two sheets of tinfoil that can be charged) basically shows the problem of electric lines in the electric field so that students can see clearly. We did the same before. However, the disadvantage of this experiment is that it only allows us to see the plane and can not see the three-dimensional graphics, which is not convenient for classmates. According to the Northeast People’s Ministry of Education compiled high school textbook physics pointed out that experimental power line method can overcome this shortcoming. Textbook practice is to mix quinine powder or asbestos dust in petrolatum or castor oil, and then held in the electric field, you can see the results. But we did not have quinine powder or asbestos on hand, so sawn timber was chosen