Abstract
The procedure of grinding of Fe in oil or benzol was observed and the results were compared with those described in the previous report (the grinding procedure in air): (1) The diffraction patterns in this case, in the stage of coarse grinding, were very sharp and in good contrast compared with the case of in-air-grinding. The reason lies in (a) the difference in the fine contour of ground surfaces of specimens, (b) the difference in the perfectness of lattice construction. (2) The oxidizing effect was much reduced compared with the case of in-air-grinding. This should be due rather to the cooling effect of liquid, than to the eftect of interception from atmosphere. (3) The extra rings (c.f. the 1st report) developed very often and very steadily in the stage of short coarse grinding, they were transferred to the reflections of Fe3O4 in the next stage of grinding. The substance giving these extra rings was unknown but supposed to be of the construction some what similar to Fe3O4.
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