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14 inches 9 inches Adams and Williamson anneal and cool annealing furnace annealing period annealing temperature ANNEALING THE GLASS Approximately 5,000 pounds average tempera average temperature B. S. Journal ball clay base plate batch borosilicate crown glass bricks casting the glass cent checkerwork data of Adams diatomaceous silica dimensions Disk for Telescope disk of glass edge Eighteen heating elements Feldspar flues glass might flow heating current inches deep inches high inches in diameter inches thick initial burning initial cooling rate insulation Journal of Research kaolin 9 large telescopes Manufacture of Glass melting furnace melting pot mold and annealing molten glass nicol prism obtained optical instruments optical-glass oxide peepholes peratures pieces of glass plaster of Paris possible potentiometer power line properly melted quartz disks removed ribs ring RP97 FIGURE sheet asbestos stresses tap the pot Telescope Reflector temporary dampers thermocouples ture upper surface water-cooled metal plug weigh approximately