acoustic ハ、materia ト接触面ニ於イテ 作用線ヲ持ツ。 T.theodor 2023.2.26.
acoustic ハ、 materia 有リ。 T.theodor 2023.2.26.
metal ハ、ductility ハ低ク、lustre ハ少ナク、electricity ハ低ク、29 Cu 迄也。 T.theodor 2023.2.26.
attractive force、repulsive force ハ、一定範囲内之作用線ヲ持ツ。 T.theodor 2023.2.26.
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