In this paper, the possibility of application of auto-vapor system salt boiling to the Set-Inland Sea Area is discussed, and the conclusions are as follows:-
1) In this area the auto-vapor system salt boiling directly from sea water is rather unsuitable from the stand point of energy-economics.
2) Concerning with the combination of customary solar concentration method and the auto-vapor system, 3 different cases are considered, and it is concluded that the substitu'ion of the vacuum pan evaporators with auto-vapor system is only considerable, but yet there are many cuestions which shall be solved by further study.
3) So it may be better for the Seto-Inland Sea Area to study about the improvement of the customary solar concentrating salt field.

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From May, 1942 to August, 1945, the writer was on a duty, as a chemical engineer of Nippon Salt Manufacturing Company, in the salt-works in Hishika District of Kanto-shu, and was in charge of manufacturing technicue in a factory of treating bittern.
According to his experiments in those days, chemical composition of the bittern, produced in the solar-salt-field, has some connections with weather conditions, that is the temperature, the rainfall and the evaporation of water.
And the bittern, produced in the spring, has an unusual type of chemical composition, but that, produced in the autumn has a ordinary chemical composition. The works were carried out by the kind guidance of prof. M. Tshibashi, Kyoto: University, to whom the writer expreses his hearty thanks.

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Vol. 4 (1950) No. 3-4 p. 10-18
修正箇所：その他

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Sea-water and concentrated sea-water are shallowly (depth2-4cm) reserved in the pols which are the main parts of the salt-field and built of soil at the seashore.
These pools consis of the evaporation pools for concentrating sea-water till it is saturated with sodium chloride and the crystallization pools for crystallizing sodium chloride from the saturated scution. The soil foundation of any Tool must he compacted for preventing the leakage of water and as for the crystallization pool, specially hardened for gathering salt in the mother liuor.
(1) We measured the degree of compaction and hardening by the Tamura's falling-type hardness-meter.
(2) Hardness was measured by the: penetration depth into the soil foundation of pools.
(3) The penetration deaths for evaporation pools in the Ex-Kanto Salt Research Laboratory Salt-field were in the range from 6 to 28 cm and those for crysallization pools from 3.5 to 8cm.
(4) In the same salt-field, there is generally significant differences between the penetration de th for the evaporation pool and that for the crystallization pool.
(5) It could not be guaranteed that the aoil foundation of the same pool was in the equally compacted and hardened state.
(6) There was such case as the last pool was more compacted than the first one and also the reveree case about the evaporation pools which were placed in a row.
(7) The sample coefficients of variation were in the range from 1.2 to 15.4% and the sample mean was 7.7%. It was decided that measurement could be carried into effect with no sacrifice of precision for any penetration depth.

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