Show PORTLAND CEMENT MAKING ON SCIENTIFIC LINES LINES' I ANN ARBOR Mich April 14 H. 14 Prof Edward D D. Campbell the blind professor sor of of analytical chemistry in the University Uni Un- verity of of Michigan is engaged 1 upon pon the first of a series of ot experiments that will take years of labor before completed com corn When finished the results it is expected will be of inestimable value to the manufacturers of Portland Ce- Ce ment as this product will be he turned out outon outon outon on as scientific a bass as is steel at the tle present time Prof Campbell ha hat devised the first furnace in which t the te e factors of time and temperature ca can call be absolutely con controlled controlled controlled con con- trolled and his test will cover covel all complications corn com of clay and marl Prof Campbell is said mid to be the first to take u up the work on this absolutely scientific plan |