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By using a condenser bank of the capacity 9000 μF and the working voltage 3.3 kV, magnetic fields higher than 400 kOe have been produced in a pulse form, the duration of which is about 1 ms. In order to avoid the mechanical breakdown of the coil, various types of coils including a toroidal transformer-type device have been constructed. Using these fields, various experiments have been performed. Magnetization parallel to the axis (hard axis) of the Tb single crystal in the magnetic fields of 200 to 620 kOe at 77°K caused an appreciable lattice elongation parallel to the axis, which resulted in an appearance of the local anisotropy with its hard axis perpendicular to the axis. Measurements of the magnetoresistance effect of dilute alloys and the high field susceptibility of ferromagnets are also described.