18. D. Kuroiwa and F. Tadano : A study on the Nucleus of Fog by Means 



of the Electronic Microscope 



Depositing fog particles on a collodion membrane, the authors investi- 

 gated the remnants left after the evaporation of fog particles by means "of 

 an electronic microscope. After examining thirty cases, kinds of bacilli 

 and the particles of aerosols were found, while the existence of the crystal- 

 line sea salt was quite rare. 



19. K. Fukutomi : Measurement of the Liquid Water Content of Fog and 



of the Amoiint of Chlorine Contained in the Large Drops of Fog by 

 the Gauze Filtering Method 



The liquid water content of fog was measured by the method men- 

 tioned in the item 4 above, arid a value of about 10 to 100 mg./m^ was 

 obtained. Also the amount of chlorine contained in the fog particles 

 large enough to be captured by the gauze filter was measured. As the 

 results of this it was found that this amount of chlorine is less for those 

 fogs with more liquid content, being 7-4 mg./l for fogs at Nemuro and 

 1-8 mg./l for fogs at the top of the Mountain Niseko. 



Part III — Meteorological Researches on Fog 



20. T. Lsobe : Estimation of the Vertical Extent of Fog from the Amount of 



Lnsolation 



Comparing the records of insolation made by the Robitsch pyrhelio- 

 meter and the vertical extents of fog measured by means of a balloon the 

 author studied the relation between them, and ascertained that the 

 vertical extent of fog in fair weather can be estimated by measuring the 

 amount of insolation. 



21. Y. Miyake : Estimation of the Vertical Extent of Fog by Means of 



the Solar Ultra-violet Ray 



The author measured the absorption rate of the solar ultra-violet ra\' 

 iji the fog, and ascertained that the vertical extent of fog in fair weather 

 can be approximately estimated by measuring ultra-violet radiation at 

 the ground. 



22. U. Nakaya and H. Nakahara : Vertical Distribution of Illumination 



in Fog 



Authors investigated the vertical distribution of illumination in fog 

 by means of a balloon equipped with a lux-meter, and found that the 

 illumination increases almost linearly as we go higher up in the sky. By 

 studying the relation between the rate of such increase of illumination 

 and the nature of the fog it was ascertained that the vertical extent of 

 fog can be estimated by measuring the illumination on the ground. 



23. U. Nakaya and K. Tsnneizumi : Relation Between Temperature 



Inversion and Fog 



Authors made observation of the vertical distribution of the air 

 temperature in fog by means of a balloon almost every day in July and 

 August, 1944. In most cases measurements could reach several hundred 

 meters above the top of the fog, and details of the relations between fog 

 and temperature inversion were revealed. 



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