It was found that the lead sheath of the Aomori-Noheji telephone cable line buried in the soil is corroded.
The corrosion has been intensed at the neighbourhood of the Asamushi hot spring.
It was revealed that the corrosion was carried by organic acids, which is produced from the putrefaction of juite surrounding cable sheath.
The asphalting of juite was inadequately.
In the soil at the Asamushi area, much amounts of chlorine ion was found.
It was able to intense the corrosion.
To ascertaine these results, the laboratory corrosion test copied the real conditions were carried out and they were proved.
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