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September 7, 1964


JAMA. 1964;189(10):767. doi:10.1001/jama.1964.03070100061014

In industries such as steel, aluminum, and glass manufacturing and deep mining, workmen may be exposed to heavy thermal stress. When heat is accompanied by high humidity, due either to subtropical climate or to the addition of water to the atmosphere as may occur from wet drilling in mines, normal body cooling through sweat evaporation is impaired, and the risk of heat casualty is increased.

A simple, low-cost method for providing a microenvironment of cool, clean air for the man at work, based upon the use of the Ranque-Hilsch vortex tube, has now been devised. The vortex tube is lightweight and operates on standard industrial compressed air as the sole source of power. The device has no moving parts and requires very little maintenance. Described as a simplified radial-inflow turbine, it converts compressed air into a hot and a cold stream.1 One model of the vortex tube that is

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