The blocking-layer photocell, having several advantages, has recently become noticed as applicable in meteorological works. With “Mazda” selenium photocell, we have made a trial measurement of the distribution of sky-light Difficulty arising from the fatigue was scarcely found when the light falling upon the cell was suitably limited. We obtained among others some noteworthy results, that (1) magnitude an distribution of brightness near the sun for the cloudless, but very turbid sky due to the “yellow dust” quite resembles to that for the overcast sky with thin CS cloud; (2) “Isophoten” near the sun is quite circular in comparison with somewhat elliptic observed by C. Dorno
On the 21 st. September 1934, the severe typhoon has attacked the city of Oosaka giving there and its neighbouring places many damages. This typhoon travelled to the Japan proper from the southwestern sea as is shown in Fig. 1 (p. 508). From the studies of thunderstorms the present author has noticed the fact that the thunderstorms have been observed at several places before the typhoon centre arrived. (Fig. 1) The thunderstorms of this nature are to be caused by the upward currents at the mountainous parts of the Japan proper, hence there the line of discontinuity, too, is likely to be observed before the arrival of typhoon. From our experiences we see that the line of discontinuity at the head of the typhoon in the middle latitude is apt to lead the typhoon. The present author investigated the thunderstorms occurred at the head of the various typhoons which attacked the Japan proper during these 12 years with the result showing that the thunderstorm is also apt to lead the typhoon. This fact may contribute to the forecasting of the path of typhoon at the Japan proper and its vicinities, because the line of discontinuity is not always perceived markedly on the synoptic chart, while the thunderstorm is very easily reported so far as the observing stations are comparatively numerous and the observations are communicated rather quickly to the weather bureau and the like.
It is well known by experiments made on some rocks that they can not be regarded as perfect elastic bodies but as considerably viscous. The mathematical expression for their stress-strain relation has been given as a form of in the 1st approximation. A property expressed by the former formula is called fermoviscosity and that expressed by the latter is called elasticoviscosity or plastisity. The author has treated mathematically the viscoelastic waves for the two media above mentioned in the same manner, and then tried to explain the peculiar form of ScS wave observed in seismograms assuming that the core of the earth has a plastic property.
According to the ordinary sunshine recorder, we can not distinguish the effects from the records produced by clouds and by the obstructions on the ground. In order to distinguish them (from the stand point of my cloud study), I tried to make a special theodolite deviced for the measurement of the duration sunshine, with the consideration of the heights of obstructions on the ground. This theodolite is composed of four principal axes of rotation which are arranged by special relation between their positions. The principle is the same as that of an astronomical telescope, but this small telescope can instantly have an axis of rotation, at any district, parallel to that of the earth.
The wave length of the surface wave can be culculated from its period. The periods of the surface waves on the Totominada were observed from August to October in 1934. The maximum values of the wave length and the period of Muroto typhoon were 600 meters and 19 seconds respectively. When Totominada was set in the umbra of the surface waves produced by Kii peninsula, both the wave length and the period on Totominada suddenly fell. As the result of observation, the wave length of the surface waves produced by the typhoon in October proved to diminish by 62 meters, compared with the value of the wave length of the furface waves when that typhoon was in rest. This is the Doppler's effect.