Diamond grinding of glass

Claim 1

APPARATUS FOR THE CONTINUOUS SURFACING OF THE PRINCIPAL SURFACES OF A CONTINUING SHEET OF PLATE GLASS AND THE LIKE, COMPRISING A PLURALITY OF DIAMOND GRINDING STATIONS ARRANGED SERIATIM IN A GRINDING LINE, MEANS FOR ADVANCING THE SHEET OF PLATE GLASS SUCCESSIVELY THROUGH EACH OF SAID PLURALITY OF GRINDING STATIONS, EACH OF SAID GRINDING STATIONS INCLUDING A GRINDING WHEEL HAVING A GENERALLY ANNULAR ABRASIVE GRINDING FACE OF PREDETERMINED EFFECTIVE RADIAL WIDTH WITH DIAMOND PARTICLES BONDED THEREIN, SAID EFFECTIVE RADIAL WIDTH BEING OF A SIZE EQUAL TO OR LESS THAN 0.36 INCH, SUCCESSIVE ONES OF SAID PLURALITY OF DIAMOND GRINDING STATIONS RESPECTIVELY HAVING PROGRESSIVELY HIGHER CONCENTRATIONS OF SAID DIAMOND PARTICLES IN SAID GRINDING FACE, THE AVERAGE PARTICLE SIZE OF SAID DIAMOND PARTICLES IN EACH OF SAID FIRST AND SAID SUCCESSIVE GRINDING STATIONS BEING SUBSTANTIALLY WITHIN A RANGE OF FROM 275 TO 68 MICRONS, AND MEANS FOR INTROMISSIVELY SUPPLYING COOLANT BETWEEN SAID GRINDING FACE OF EACH OF SAID DIAMOND GRINDING WHEELS AND THE SURFACE OF THE SHEET OF PLATE GLASS BEING GROUND THEREBY.