To obtain a bevel edge on plate glass, either circular revolving tables or fixed ones maybe used. The table for grinding is of thick cast iron, and is fed with sand and water the smoothing table is of glass with emery of different degrees of fineness and water, and the polishing tables are of wood covered with leather or felt and sprinkled with rouge of increasing degrees of fineness. If revolving tables are used, the glass plate must be fixed in a frame capable of being adjusted at any required angle, and the frame must be Drought down until the edge of the glass just touches the table. As the grinding proceeds, the glass is brought lower until the bevel is fully formed. After bevelling all the edges the glass must be transferred tothesmooth-iug table, and finally polished on the wood table. If fixed tables are used, the frame containing the glass plate will have to travel perfectly true backwards and forwards over the tables.