Abstract
FOR WELL over a century it has been known that excessive noise may cause impairment of hearing. Bunch1 refers to the work of Fosbroke, who, in 1831, gave a lucid description of deafness in blacksmiths. Not only did the industrial revolution, which had its onset about that time, cause an extensive social upheaval, but its development was accompanied by progressively louder industrial and community noise. In a previous article I2 evaluated the literature relating to occupational deafness and also reiterated basic criteria for the diagnosis of occupational deafness. The laboratory work of Wittmaak,3 Lurie,4 Brunner,5 and others confirmed scattered clinical observations relating to the susceptibility of the inner ear to trauma, excessive noise, and chemical poisons. Since 1945 a considerable amount of work has been published about the harmful effects of excessive noise and changes in barometric pressure in military personnel. These papers have again

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