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Device for mechanical calculating an integral of the form of? r d (a), in which r is proportional to h + ¬?, and l and a is the polar coordinates, in particular, for the determination of the influence of a body of any cross-section on the heavy
Device for mechanical calculating an integral of the form of? r d (a), in which r is proportional to h + ¬?, and l and a is the polar coordinates, in particular, for the determination of the influence of a body of any cross-section on the heavy
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机译：用于机械计算积分形式的装置？ r d（a），其中r与h +¬？成正比，l和a是极坐标，特别是用于确定任何横截面的物体对重物的影响
