This paper depicts the historical evolution of ultraviolet devices in Japan during the interwar period. The outbreak of the First World War spurred the development of the glass industry in Japan, being triggered by the military demand on optical instruments in particular. Meanwhile, physicists needed special glass which could cut off ultraviolet radiation to protect the eyes during spectroscopic experiments. Furthermore, as the effects of the invisible rays on human health came to intrigue the medical and lay audience introduced by the works of Niels Ryberg Finsen, artificial sun lamps for actinotherapy were devised, fn Japan, Tokyo Electric (a forerunner of Toshiba) together with the physicist, Nagaoka Hantaro, promoted the development of anti-ultraviolet glass. A national institute based in Osaka chased the project. Eventually, with the advent of knowledge regarding the glass which was practically transparent to ultraviolet rays, the electric company launched a commodity for lay consumers in 1930. The electric device manufacturer produced ultraviolet radiators as a "load builder," during the times when the supply of electricity in Japan exceeded its demand. Ultraviolet radiators, used as tools for hygiene and public welfare as well as for medical treatment, thus trickled onto Japanese soil by the next World War.

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Introduced by Karl Schwarzschild in 1916, action-angle variables provided effective mathematical tools with which to examine quantum phenomena. No historical work describes clearly how Schwarzschild came by the idea of them. This paper shows that the original idea of action-angle variables was substantially outlined in Charlier's two-volume textbook. Mechanics of Heaven, published in 1902 and 1907. In Volume 2. Charlier extended Jacobi's results and examined a leading function of a canonical transformation. He showed that a complete solution of the Hamilton-Jacobi equation of an intermediate orbit for given canonical equations becomes the leading function. The Hamilton-Jacobi equation for any intermediate orbit was found to be solvable. Charlier was then able to actually perform the canonical transformation, attaining new canonical variables that involved arbitrary constants of the solution to the equation of the intermediate orbits. He related the arbitrary constants to original canonical variables and changed the new canonical variables into new ones (ξ_i, η_i), that depend on an intermediate orbit. In this process, he used Stackers results as demonstrated in Volume 1. Charlier showed that if a Keplerian ellipsis is taken as the intermediate orbit. ξ_1 becomes an element of action integral multiplied by 1/π and η_i=η_it + β_i an argument of angle of a moving point, where n_i is frequency, t is time, and β_i is an arbitrary constant. Schwarzschild noted this fact and thereby attained his formal definition of action-angle variables.

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This paper depicts a part of the development of particle physics in Japan after the Second World War. treating the relationship between the establishment of the Yukawa Hall (YH) and the activities of the "Soryushiron Group (SG)." The YH opened as an institute for theoretical physics at Kyoto University in August 1952 in commemoration of Hideki Yukawa's winning of the Nobel Prize in Physics for 1949. The SG was organized mainly as a society of the Japanese young researchers of particle physics in April 1952. Although the previous related studies have argued that the idea of the establishment of YH was deeply connected with the mind of SG. this paper reconsiders how the members of SG worked on the start of YH. who were the main actors of SG in the process of establishing YH, and what these actors did in the formation of YH. Finally it concludes that the different generations of SG represented by "Bosses" and "Young Researchers" played the different roles, preparing the basic constitution of YH. and making the effective systems for promoting and supporting the researches of particle physics.

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