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 responses links on the size of the rod sections.; In the proposed device, all sections are telescopic rod, the outer telescopic rods each compound are made to the terminals at the ends directed to the average horizontal section of the right, the lower left horizontal portion and vertical portions - down. 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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