初等变換的工具,此較常見的有相似变換器和反演变換器。我设计了中心对称器、轴对称器、平行器、旋轉器等四种工具,并且作了实驗。現在提出来供同志們参考,希望同志們提出宝貴意見,使这些初等变換工具更加完善。 1.中心对称器构造如图1,用特殊螺絲釘把六根直尺(其中四根长度相等,另两根的长度是这四根的两倍),在O,A,B,C,D,E,F七处互相連接起來,使連接处可以轉动,并使 Elementary transformation tools, which are more common with similar converters and inversion converters. I designed four tools such as center symmetry, axis symmetry, parallelism, and rotator, and made experiments. They are now proposed for reference by comrades and hope that the comrades will put forward their valuable suggestions to make these primary transformation tools more perfect. 1. The center symmetry structure is shown in Fig. 1. Six straightedges (four of which are equal in length and the length of the other two are twice the length of the four) are screwed with special screws. In O, A, B, C, D, E ,F seven connected to each other, so that the connection can be rotated and