Illinois Statutes Chapter 225. Professions,Occupations and Business Operations § 705/33.04. Floor elevation, etc.; underground maps

§ 33.04. Each underground map shall show, in feet and decimals thereof, the elevation of the floor of the coal at reasonable intervals on the main entries and cross-entries from the bottom of the shaft to the face of the workings; such elevations shall be referred to the floor of the coal at the bottom of the hoisting shaft.