Show how a diamond cuts glass I 1 it has been ascertained by a series eerie at experiments that a diamond does docs not cut glass fale fashion but forces the particles apart so BO that a continuous crack Is formed along the line of the intended cut the crac crack konce once begun very small force Is necessary to carry it through the glass and thus the piece Is easily broken off the superficial crock or cut need not be deep a depth according to line fine measurements uret ure ments of a two hundredth part of 0 one inch Is quite sufficient to accomplish the pir purpose pose so that the tha application of much force in using gAhe the diamond only wears out the gem without doing the work any better numerous Numero aa stones such as quartz and other minerals eeals when ground into proper form will cut glass like a diamond but they are not ot so valuable for that purpose lacking the tha requisite hardness a ud nd soon losing the sharp edge necea mary to make the operation a success |