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本刊82年第3期实验拾零一栏介绍了湖南宁远县一中何家宁同志的 B=K(I/r)演示仪器,关于指示数据的方法,我们作了一些改进,介绍如下:原指示器用的是量角器指示数据(实验装置见82年第3期),我们改用一支透明的有机玻璃刻度尺直接读出函数值,节省了查正切函数表的时间,提高了课堂教学效率。具体作法如下:把刻度尺与小磁针的顶针按装在同一块有机玻璃板上,使刻度尺与南北方向线垂直,并把刻度尺与小磁针顶针间的距离定为一单位
In the 82th issue of the journal Experiment No. 3, the article introduces the B=K(I/r) demonstration instrument of Comrade He Jianing of Ningyuan County, Hunan Province. Regarding the method of indicating data, we made some improvements and introduced the following: The instrument uses the protractor indication data (for experiment setup, see No. 3 of 82). We used a transparent plexiglass scale to directly read out the function value, which saved the time of checking the tangent function table and improved the efficiency of classroom teaching. The specific method is as follows: Place the scale needle and the thimble of the small magnetic needle on the same organic glass plate so that the scale is perpendicular to the north-south direction line, and set the distance between the scale and the small magnetic needle thimble as a unit.