ADJUNCT TO A247 TEST METHOD FOR EVALUATING THE MICROSTRUCTURE OF GRAPHITE IN IRON CASTINGS (GRAPHITE FORM TYPES; 17.5 BY 9 IN, GRAPHITE SIZE, MAGNIFICATION 100 DIAMETERS; 24 BY 9 IN, GRAPHITE FLAKE TYPE CHART, MAGNIFICATION; 100 DIAMETERS; 37 BY 9 IN)