笔者巧妙利用阿基米德原理和杠杆平衡条件,制作了一种能直接读出密度比水大的固体密度测量仪器。如图1所示,O为杠杆AB的支点,调节A端的平衡螺母(在实际制作中,可以用1段细铁丝绕在OA段的某个位置作为平衡螺母使用),使之水平平衡。用1根细线将待测固体系于A端,往系于B端的小桶中加减石子和砂子或沿着AO移动待测固体的位 The author clever use of Archimedes principle and lever balance conditions, produced a direct reading density than water density solid density measuring instruments. As shown in FIG. 1, O is the fulcrum of the lever AB, and the balance nut on the A side is adjusted (in actual production, a section of thin wire can be used as a balance nut around an OA section to balance the horizontal balance). Use a thin line to test the solid system at the A side, to the Department of the B-side buckets to add stones and sand or move the AO along the AO to be measured