1. Production by means of caustic soda.
(1) Experiment of Nagai Branch, Central Laboratory of Monopoly Bureau.(M. Nasu, S. Furihata, S. Shimizu) Mg (OH)₂is completely removed from sea water by means of equivalent quantities of caustic soda and Ca-contents in its treated sea-water, is diminished about its 30% being its PH about 11. The crystal growth is good being added soda during about 4hrs. and ppt. ing velocity is 11C. C. Filtration also, is easy.
(2) Experiment at Nagai Experimental Station, Meiji Mining Comp. Ltd.(S. Tomoda, K. Nakahara, T. Otsuka) Being added Soda during 2hrs. crystal growth is good and its ppt. ing velocity is 6.2C. C. Filtering by filter press is, also, easy. The other results are equal to the above experiment.
(3) Experiment at Sakata Factory, Nissin. Denka Comp. Ltd.(K. Nakahara) All detas of the experiment are same the above condition.
2. Production by means of lime.
(1) Experiment at Nagai Experiment Station, Meiji Mining Comp. Ltd. All experimental results_by means of lime are parallel to the soda experiment but produced magnesium hydroxide contains much CaCO₃(Ca, 10%) than soda magunesuim hydroxide(CaCO₃, Ca. 7%).
(2) Experiment at Niihame Factory, Sumitomo Aluminum Manufacturing Comp. Ltd.(S. Nakamura, S. Mori, T. Otsuka).
All datas are same as above, but experiment on oliver filter was carried out with good results.
3. Production by me ns of dolomite.
Light burnt Japanese dolomite was used as matirical. Magnesium hydroxide is deposited as same as soda or lime. This method is now carrying out at Oiso Factory, Kaiyo Comp. Ltd.

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If the suspension of basic magnesium carbonate in mono-Cl-benzoi is heated or cooled, the colour of penetrated and scattered lights change. We can determine the refractive index of basic magnesium carbonate to green light (about 5380Å) by measuring the temperature, at which the scattering light presents pink.
Each sample of basic magnesium carbonate has a little different index (1.51-1.54), and I think this is a main reason for transparent rubber to show different colour by each basic magnesium carbonate.

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We investigated about salt removal apparatus for crystallizing evaporator in vacuum-and autovaporsystem which being used nowaday. To make the crystal particle size uniform, to remove impurities, to make the product high degree of purity, and to make the handling continuous, we devised “settling leg”, and tried fundamental experiments. To the crystallizing evaporator “settling leg” was attatched, in which liquid flow upwards from the bottom. The distribution of grain diameter of common salt manufactured by various methods and of the impurities was measured. At many temperature, the relation between grain diameter and terminal settling velocity was experimented, and we calculated relative formula for various range of concentration. We got good results by using “setting leg” in the experimental apparatus on a small scale.

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One of surface active agents was found to be good defoamer for salt making evaporator.
By using it, water-level control becomes easier, salting-up decreases, the evaporator can be washed not so often, the range of salt particle distribution decreases, evaporation is not interfered.

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