坑内夫の聴力検査成績

　緒言

　炭鉱坑内夫には職業性難聴の惹起することは，既に幾多の文献があるが，金属鉱業所に於ける研究成績は余り発表されていない。しかしこの職場に職業性難聴の発生することは当然であり，その衛生管理は等閑視さるべきではない。

　この金属鉱業所に於ては騒音の実態調査を施行し，各所に恕限度を越える騒音を確認した。

　かかる騒音下に働く者に騒音性難聴がどの程度にあるか，その基本資料として金属鉱山の坑内夫に就き，第一回聴力検査として施行したのでその大要を報告する。

With a suspicion that occupational deafness that occur in the coal miners may similarly exist among workers of metal mines 890 in-dividuals of the latter were examined withhearing test.

The number of occupational deafness was 57cases in all and among them only six cases were valued to be eligible for workman's compensation ; the number thus affected was quite low.

There were a few cases of nerve deafness-due to general physical conditions as well as allergic diathesis who showed a medium toneloss but the degree of this loss was rather slight.

Occupational noise in these miners appeared to influence them very slightly even among those who showed otitis media in their history but in the ones employed for rock-blasting the relation of history of otitis and the eighth nerve affection appeared to be highly vivid for the worse.