A simple penetration device for measuring the consistency of fresh concrete was recently announced by two men working at the University of California at Berkeley. The device is a portable metal ball, named the Kelly ball, that penetrates the surface of concrete. Tests made with the Kelly ball at the University of California and elsewhere show results that compare favorably with results obtained through the more commonly known and used slump test. The results were so close that the Kelly ball was given a tentative standard rating by the American Society for Testing Materials. The Kelly ball is made up of a steel handle, a vertical rod marked in inches and half inches with the inches numbered, a metal ball 6 inches in diameter and 4 5/8 inches in height, and a stirrup or frame into which the ball is set. The semi-circular bearing plates at each foot of the frame were added by the Bureau of Public Roads as an improvement over the original Kelly ball that was given a tentative standard rating by the American Society for Testing Materials. A detailed sketch of the Kelly ball will by supplied free of charge on request. Write the Editor, Concrete Construction Magazine, 139 N. Clark, Chicago, IL