24. /. Stigaya : Study of the Advedion of Fog by Observations on a High 



Mountain 

 The author made observations on the summit of Mountain Shari 

 (1,650 meters in height), to the extent of 60 to 90 km. from the summit, of 

 the speed and course of the advection of the sea fog, its relation to the 

 wind direction, and the dissipation of fog, as well as the formation and 

 dissipation of mountain fog. 



25. U. Nakaya and K. Yoshino : Study of the Advection of Fog by Means 



of Slow Speed Cinecameras 



Authors filmed the advection and dissipation of fog by slow-speed 

 cameras installed (1) on Mount Shari, (2) on a balloon flown above the 

 City of Nemuro, and (3) in the seashore of Katsuragi. By these means 

 the aspects of the fog preceding a front, the dissipation of fog, the wave 

 motion of a fog layer, the vortex motion in the uppermost layer of 

 dissipating fog, and the dissipation near the ground were made clear. 



26. U. Nakaya, K. Takahashi, and H. Fuchi : Dissipation of Sea-fog 



as it Moves Landward 

 In order to make clear how the sea fog is gradually dissipating being 

 warmed at the ground as it moves landward, we made simultaneous 

 observations at ten points within the range of three kilometers, of the 

 variation of air and earth temperatures, humidity, fog particles, salinity, 

 visibility, &c. According to these observations it may be concluded 

 that the fog is practically dissipated when the air temperature rises 

 about 3-5° c. 



Part IV. — Researches on Artificial Dissipation 



27. K. Takahashi : Dissipation of Fog by Turbulence 



The author discussed the possibility of artificial dissipation of fog 

 bv causing the upper air of high potential temperature to fall to the ground 

 in turbulence, utilizing the temperature inversion which accompanies 

 the fog. 



28. K. Takahashi : Removal of Fog by Means of an Obstacle 



Since fog becomes thin on the lee side of a wood, the author made 

 calculations to ascertain the size of this " shade of the fog " according 

 to that of the wood and the speed of the wind. 



29. K. Takahashi : Dissipation of Fog by Heating 



The author experimented on the dissipation of fog by forming a 

 hot spot on the ground, and, on the basis of the results obtained he 

 calculated the minimum increase of the temperature needed for dissipating 

 the fog, the process of the diffusion of heat, the loss of heat by radiation 

 or turbulence, &c., and discussed the practicability of dissipating a large 

 mass of fog. 



30. /. Yoshida : Measurement of Evaporation of Fog Particles 

 Taking up the stationary state where fog particles from outside are 



disappearing, the velocity of evaporation of fog particles was observed.. 



85 



