The Coal Division of the Illinois State Geological Survey employs the Hollerith punched-card system for recording and tabulating data used in the preparation of structural contour maps based on the altitude of key coal beds. By the use of the punched-card method, after data are once recorded accurately, no further checking is necessary, no matter how they may be reorganized or summarized. A similar system is also being used for recording and tabulating the great variety of information on the chemical characteristics of Illinois coals and coal ashes.

First Page Preview

First page PDF preview
You do not currently have access to this article.