By the method of coincidence of three Geiger-Müller tubes in line, cosmic ray observation is now in progress at Misima Observatory. Potential source is obtained by thermionic rectifier and condenser system, the fluctuation being controlled by the method of Street and Johnson. Coincidence is selected by the circuit proposed by Rossi and amplified with a thyratron TX930 to operate counter. In this preliminary note, we report mainly about some experiences of the Geiger-tube technique. It seems to us that the countvoltage characteristic is sensitively influenced by the inner surface condition of outside tube rather than the inner electrode. As for the actual counting due to cosmic radiation, we give only an example, as the sufficient data are not yet obtained.
The authors of the present paper investigated statistically the phase difference between the corresponding pulsation of terrestrial magnetism and earth current recorded at Toyohara Magnetic Observatory. The results were compared with the values theoretically derived assuming the earth surface being a plane. The main results are as follows:- (1) The forced oscillation of the magnet of magnetometer and the moving coil of galvanometer were carefully examined, and the phase difference between the variation of the external force and the forced oscillation was calculated. The observed phase difference was corrected by this results. (2) The results are illustrated in fig. 1. The phase difference is less than that observed at Kakioka by the amount of the instrumental phase difference. (3) If we assume that the distribution of the amplitude of the variation of the magnetic and electric force takes a form of probability curve, the phase difference theoretically derived nearly coincides with the observed one. (4) In this case we notice the difference of the phase difference according to the distance from the disturbing source. Or apparently the pulsation propagates with a considerable velocity (say 1000km per second).
When Max. Margules and others first treated the problem of the diurnal variation of barometric pressure periodically heated, they confined their discussions to the case in which the temperature distribution due to the land and sea or the latitude is out of consideration. In this paper, the author intended to investigate the influence of temperature distribution on the diurnal variation of pressure and to present a method of eliminating its e ror. But if the amplitude of the pressure waves is a function of z taken in the vertical direction as well as of x, y, the solution in the general case is difficult though not impossible. Cur case which presents itself in this paper is that the motion takes place in the horizontal plane xy only and the amplitude of pressure waves varies gradually from point to point mainly in order to get a simple solution of the equation. The results obtained in our investigation may be summarized as follows:- 1. If the variation of temperature is very small, it is necessary to take the temperature at the place here considered to get rid of error in the amplitude of pressure waves. 2. When the temperature decreases northwards, the amplitude of pressure waves is rather large compared with that which the variation of temperature is ignored. If the negative temperature gradient is directed toward south, the case is quite opposite.
O. G. Sutton(1), in his work on the eddy diffusion in the atmosphere, deduced the formula σ2=1/2c2(ut)m, where σ denotes the standard deviation of the balloons from their mean path, c, m are two constants, u is the mean wind velocity and t is the time of travel, so that (ut) is the distance travelled. He himself obtained results refering the data collected by Richardson and Proctor in their researches on the scattering of small balloons, and found that m=1.75 and c lies between 10-1 and 1(cm)1/8. The present paper is concerned with a trial of such a kind of scattering of small balloons at Tokyo under auspice of the Central Meteorological Observatory. The fallen position and the time was traced after the kind reports from people who happened to catch any one of the scattered balloons. The trial was given twice, once on Sept. 4th, the other on Sept. 11th in the year of 1924. Analysing the material, under the kind guidance of Prof. S. Fujiwhara, we found that Sutton's theory may be a suitable representation of the facts of diffusion in the atmosphere. The values m and c calculated with the above two data are respectively m=1.9 c=1.23(cm.)1/2) (Sept. 4th) m=2.5 c=0.015(cm)-1/4 (Sept. 11th) and the constancy of c in each case was considerably satisfactory.
Investigated the heavy rainfall in Kyoto and Kinki district in order to search after the data of prediction for flood, the author found that there are every six forms in both. Furthermore, investigating the rainfall due to barometric depression, typhoon, line of discontinuity and anticyclone, the author also found that we have heavy rainfalls along the path of cyclone, and that it is influenced by the situation of anticyclone.
The undulations of water with the period of eleven minutes have been recorded by the tide-guage installed at Maisaka, on the shore of the mouth of Hamanako. In these mareograms are noticed considerably regular oscillations resembling beats. The author has explained them as the seiches of this lake having a fan-shape with a variable depth.