OCR Text |
Show How k Diamond Cuts Glass. It has been ascertained by a series of experiments that a diamond does Hot cut glass file-fashion but forces the particles apart so that a continuous continu-ous crack Is formed along the line of the Intended cut The crack once be-un, be-un, very small force is necessary to carry It through the glass, and thus the piece Is easily broken off. The superficial crack or cut need not be deep; a depth, according to fine measurements, meas-urements, of a two-hundredth part of one Inch is quite sufficient to accomplish accom-plish the purpose, so that the application appli-cation of much force In using the diamond dia-mond only wears out the gem without doing the work any better. Numerous etones, such a3 quartz and other minerals, min-erals, when ground into proper form, will cut glass like a diamond, but they are not so valuable for that purpose, pur-pose, lacking the requisite hardness end soon losing the sharp edge necessary neces-sary to make the operation a success. |