An experimental remote - reading and -recording instrument board has been designed and assembled in 1951. It comprises a combination wind vane and anemometer, six thermometers with sealed carbon filaments (air, wet- and dry-bulb, and earth thermometers at three depths) and a float-actuated rain gauge, with their indicators and recorders, each of which was already reported in the preceding issues of the Papers. The instruments are incorporated in an instrument board in combination with two observation clocks, an aneroid barometer, a statoscope, an aneroid barograph and a Fortin mercurial barometer, each of ordinary make. The whole equipment was installed in December 1951 at the Maebashi Weather Station, and a preliminary test was successfully gone through in June 1952.
Regarding the anomalou s distribution of ultraviolet sky radiation observed during the annular eclipse at Rebun Isla nd (N.45°15', E.141°) on May 9th 1948, an explanation wa s attempted through the calculation of the intensities of primary and secondary scattered sunlight which contains eclipse effect. According to the result of calculation the passibility of giving rise to the anomalous peak at 15° of zenith angle wa s confirmed especially in the distribution of secondary scattering, where polarization by primary scattering played an important role more distinctly than in the normal case which was discussed previously in this series. But a quantitative agreement was not yet achieved, which fact shows the necessity of considering the scattering of h igher orders than the second or other factors.
The present author de r i ved theoretically the equation for the transparency of water as follows, and by the above equation discussed the relation between transparency and the oceanographical elements which have e f f e c t s on it.
As to the quantitative analysis of the total carbon dioxide in water, there are many methods such as those contrived by VAN SLYKE, SUGAWARA-KOYAMA etc. In each method, it is necessary to make an apparatus to drive off and absorb quantitatively the carbon dioxide expelled from water. Since they are complicated, the determination of carbon dioxide is generally replaced by that of excess base or alkalinity. The present author made an attempt to apply Conway's micro-diffusion method to the analysis' of the total carbon dioxide in sea water. It is convenient and suitable for rapid determination of carbon dioxide with sufficient accuracy. She also considered the relation between pH and the total carbon dioxide in sea water and deduced a theoretical formula. The agreement between the theoretical and the observed values was fairly good.
The classification of crystal formation of Ice Crystals in the Air will be as follows:- a) Hexagonal twin prism b). Hexagonal prism (needle-like) c) Hexagonal plate d) Miscellaneous 1) Hexagonal prism 2) Hexagonal pyramid 3) Hexagonal prism with pyramid at one end 4) Combined hexagonal prism 5) Combined hexagonal p rism with pyramid at one end 6) Hexagonal prism with both ends flat and plate-like 7) Amorphous
A pyrometer which was built for the measurement of comparatively low temperature is described. The detector of the radiative energy is the recently developed PbS cell, and the amplifier system was specially designed for the purpose.