The SciencesWhat is Hardness?Strictly Speaking, Science Doesn't Know. There's Much More Philosophy to the Subject Than Meets the Eye. We Have Testers that Measure Hardness--or so We Think--and then We Define Hardness on a Basis of their Methods, Rather than Vice VersaBy S. R. Williams on September 1, 1943AdvertisementABOUT THE AUTHOR(S)Recent Articles by S. R. WilliamsOn the Trail of the Molecule—IIOn the Trail of the Molecule--I