Illinois Statutes Chapter 225. Professions,Occupations and Business Operations § 705/20.23. Dead hole; drilling or shooting

§ 20.23. No person shall drill or shoot a dead hole as hereinafter defined. A “dead hole” is a hole where the width of the shot at the point measured at right angles to the line of the hole is so great that the heel is not of sufficient strength to at least balance the resistance at the point. The heel means that part of the shot which lies outside of the explosive.