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此椭圆规系沁阳县第三中学校长(数学教师)李再宾同志所设计制作,曾获焦作市自制教具选优鉴定一等奖;河南省选优鉴定二等奖。现将其制作、使用方法及作图原理介绍如下。 一、制作方法 1.取AB、CD两条约40cm长,4cm宽、2.5cm厚的木条,中间凿成1cm宽,适当厚的槽,槽底及两壁平洁光滑。如图1所示。
This elliptical system was designed and produced by Li Zaibin, the third middle school principal (mathematician teacher) of Suiyang County. He won the first prize for the selection and identification of self-made teaching aids in Jiaozuo City, and the second prize for selection and identification of Henan Province. Its production, use methods and drafting principles are described below. First, the production method 1. Take AB, CD two treaty 40cm long, 4cm wide, 2.5cm thick wood, the middle chiseled into 1cm wide, appropriate thick groove, groove bottom and two walls clean and smooth. As shown in Figure 1.