(820 ILCS 245/1) (from Ch. 48, par. 261)
Sec. 1. When used in this Act, unless the context indicates otherwise, the term
(a) "Caisson" means a wood, steel, concrete or reenforced concrete air-tight and water-tight chamber in which it is possible for men to work to excavate material.
(b) "Lock" means a chamber designed to facilitate the passage of men and materials from an air pressure greater than normal, as in a compartment, caisson or tunnel, to the ground or water level or normal air pressure.
(c) "Pressure" means gauge air pressure in pounds per square inch.
(d) "Tunnel" means a subterranean passage or chamber.
(Source: Laws 1939, p. 614.)
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Last modified: February 18, 2015