The invention relates to laboratory equipment and can be used in teaching laboratories on theoretical mechanics of technical universities, colleges and technical schools. Known rod consists of sections of invariable size. This makes it difficult to organize the teaching and research work of students to identify the dependence of the magnitude of the reaction relationships plot size rods. In all his proposed rod portions are telescopic rods each outer telescopic connections are made with terminals at their ends directed: in the lower left horizontal portion at the upper right horizontal portion, a vertical portion downward. It is possible to organize the teaching and research work of students to identify the dependence of the magnitude responses links on the size of the test sections of the rod. Fig. 1.
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