Ill. Admin. Code tit. 35 § 211.5650
Current through Register Vol. 48, No. 45, November 8, 2024
"Ringelmann chart" means the chart published and described in the Bureau of Mines, U.S. Department of Interior, Information Circular 8333 (Revision of IC7718) May 1, 1967, or any adaptation thereof which has been approved by the Agency.
Ill. Admin. Code tit. 35, § 211.5650
Added at 17 Ill. Reg. 16504, effective September 27, 1993