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Updated: July 18, 2026
As an example of heavy pressure work under favorable conditions as to ventilation, without very bad effects on the men, Messrs. Sooysmith & Company had an experience with a work on which men were engaged in six-hour shifts, separated into two parts by half-hour intervals for lunch. This work was excavation in open, seamy rock, carried on for several weeks under about 45 pounds pressure.
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