抄録
The method of analysis. (1) The chlorine method and the hot nitric acid method are examined, each value of which can be reappeared. (2) The value of oxides by the chlorine method is higher and also more reliable than the one by the nitric acid method. (3) The chlorine method can not be adopted to the gray iron, but to the white iron. The action of oxides during the melting time. (1) When the high-temperature melting, the molten metal decreases oxides and is deoxidized better. (2) The casting which has large shrinkage cavity contains much oxides composed of silica chiefly. There is no shinkage cavity below 0. 03% SiO2, but the comparatively larger one over 0. 05% SiO2.
