In the winter monsoon season enormous masses of stable foam are produced along the shore of the Japan Sea in the Tohoku District. Wind action may then disperse the accumulated foam in fragments and carry them inland, and much damage has been caused to the electrical facilities, and to trees and farm products. In this paper wind transport phenomena and related characteristics of stable foam of sea water were treated using data obtained in situ and in the laboratory. Thus, we have found that the change in the density of stable foam is primarily due to drainage of sea water from the bubble membranes, and that this is given by the formula. d=C1e-k1+C2 where d, t, C1, C2, and k are respectively density, time and characteristics of the foam.
If a wind vane is devised w hich has practically no overshoot, considerable saving of effort will be achieved in reading and analyzing the indication and chart. A suitable device for this will be to incorporate a damper. In the present paper an oil damper is tested on a model wind vane in the wind tunnel. The degree of necessary damping of the oil damper increases exactly linearly with the wind speed, which fact suggests the necessity of a damper with variable damping. Fundamental design data of the damper and its possible configurations are given.
The programs for automatic data processing of the seismological observations in the Japan Meteorological Agency will be described. Besides, Some comments are offered on the results obtained from comparisons of epicenters calculated by the program with those given by USCGS.
The focal mechanism of earthquakes occurring in central and southwestern Japan during the period 1926-1962 is analyzed. The statistical investigations of the solutions leads to very interesting results.