LINNICK PNEUMATIC INSTRUMENT MECHANISM FOR MEASURING THE DEPTH OF SURFACE IRREGULARITIES IN GRINDING GLASS

Air is pumped by rubber bulb 1 through water-type air-pressure stabilizer 2, maintaining a constant pressure of compressed air, to orifice 3 through which it enters chamber 4. Secured on rubber membrane 5 in the chamber is steel nozzle 6 with a bevelled lower edge and carefully lapped end face. Spring 7 holds nozzle 6 against the surface of the glass being checked. A weight is placed on the top of…