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During the past six years I have observed this condition frequently in employés of the American Sheet Steel Company, and in one instance in an employé of the West Leechburg Steel Company. In these mills the twenty-four hours are divided into three periods of eight hours each and are known as the morning, day and evening "turns." The "morning turn" begins at 12 midnight and ends at 8 a. m.; the "day turn" begins at 8 a. m. and ends at 4 p. m.; the "evening turn" begins at 4 p. m. and ends at midnight. The men work morning turn one week, day turn the next, and evening turn the next; they, therefore, can not form any regular habits in regard to eating or sleeping. While at work they are constantly employed, during the eight hours, and have but a moment now and then to eat a mouthful. The
WELSH HM. MUSCULAR SPASM DUE TO MUSCULAR EXERTION IN A HEATED ATMOSPHERE: TREATMENT BY APOMORPHIN. JAMA. 1909;LII(15):1178–1180. doi:10.1001/jama.1909.25420410026002
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