以上の理論的考察から次の諸点を要約することができる.
(1) 濃縮速度の一般式を求めることができ, e, rが一定である特別な場合を従来の採かん量公式と比較し, 採かん量の値がよく一致することを確めた.
(2) 回分式運転と連続式運転との濃縮速度を比較すると, 各段階の濃度分配の仕方, 蒸発速度と損失速度の運転時間中の形によつて有利の度合が左右される. また段階を増加する程両運転方法の濃縮速度の差はなくなる傾向がある.
(3) 従来の採かん量公式からも濃縮速度を求めることができるが, これはe, rが一定の場合に相当する.
(4) 採かん量公式を計算する場合, 統一しだ計算法と各段階ごと計算法との差を求め, 差の示す傾向を明らかにした.

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We conducted a study on applying the results of our previous experiments to usual Shijoka concentrators. For this puipose, we constructed. in salt-fields a pair of small Shij6ka concentrators (8m length, 3m depth, and 3m height) and also larger ones (10m length, 12m depth, and 5m height). One of each pair of Shijoka was covered with boarding or plastic films, and was operated as the experiment plot against the other one as the control plot. Thus, we tested the evaporating efficiency of each Shijoka.
We also used two 1/10 scale model of Shijokas placed in a wind tunnel and determined the distribution of the wind velocity in each Shijoka. From those experiments were obtained some satisfactory results.

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強制通風向流型枝条架において水温降下は通常の場合ほゞ3m高さ以内で急激に終了する. 総話容量係数は枝条, ネツト共に他の充填物に比較し良好で, 枝条よりもネツトの方がやや良い. 空気の圧力損失においては, 枝条は他の充填物に比較してきわめて小さい.
総括的に見て, 性能, 価格の点で枝条, ネツトは非常に良い冷却塔充填物であることが明らかとなり, 本型式の枝条架が濃縮用としては不利であるが冷水用として有利である理由を明確にした.

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The transfer rates of chloride ion through anion exchange membranes were measured at the temperature of 30°C. The cell used for this study consisted of seven compartments with anion exchange membranes and cation exchange membranes arranged alternately.
In the alternate four compartments of the cell the sodium chloride solution was made circulate, and in other three compartments the sodium nitrate solution was filled.
As a result, it was recognized that the transfer of chloride ion was promoted as the concentration of sodium nitrate solution increased, and on the other hand it was retarded when sodium nitrate or sodium sulfate was added to the sodium chloride solution. These facts suggested that the ion exchange reaction played an important role in the diffusion of counter ion through the ion exchange membrane.

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The permselectivity of chloride and sulfate ions was examined at 30°C with the use of a seven compartment cell. Each compartment of the cell was separated from others alternately with cation or anion exchange membrane. The concentrating compartments were filled with the solution of 0.1 N-NaNO₃, and then the mixed solution of NaCl with Na₂SO₄ was fed into the diluting compartments. After an electrodialysis was completed, both the ions of the solution in the central concentrating compartment were determined.
The permselectivity of the sulfate ion against the chloride ion was much lower than the unity, but it increased in general when the concentration of chloride ions was decreased or when the current density was increased.
It is considered appropriate to measure the permselectivity of anion exchange membranes under such conditions that the concentration of chloride ions is more than 0.5 N and the current is in the range of 0.5-2.0 A/dm².

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