抄録
A thin layer of fine aluminium powder covering the upper end of a can, which is beaten repeatedly at its centre, assumes gradually an arrangement in granules as shown in Fig. 1. Employing 1/2 LB salmon cans prepared in one and the same case by Nichiro-Gyogyô Kabushiki-Kwaisha, the present authors counted the number of beatings of constant strength, N, which was necessary for the complete appearance of the figure all over the upper end, and examined the relation of it to the weight, W, and vacuity, V, of each can. N increases with W as shown in Fig. 3, while the ratio of N to the mean value, N0, given by the empirical relation of N to W, seems to increase with increasing vacuity (Fig: 4).
