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<br />. <br /> <br />. <br /> <br />, <br /> <br />t <br />J <br />, <br />t. <br />t <br /> <br />t <br />I <br />, <br />, <br />I <br />, <br />l <br />:. <br />, <br />I <br /> <br />. <br /> <br />" <br /> <br />100 <br /> <br />WEIGHT OF STONE IN POUNDS <br />3000 1000500 300 100 50 30 10 <br /> <br />90 <br /> <br /> <br />80 <br />I- A;'(24) <br />J: 70 <br />C) <br />j;j <br />~ <br />> 60 <br />m <br />0:: <br />w 50 <br />~ <br />u... <br />~ 40 <br />w <br />U <br />~ 30 <br />a.. <br /> <br />\.c'" (24) <br /> <br />';4"(36) <br /> <br />\ <br /> <br />\ <br />\ <br /> <br />20 <br /> <br />\ <br /> <br />10 <br /> <br />. <br /> <br />.. <br />.. <br /> <br />o <br />60 40 20 10 8 6 4 2 <br />MEAN DIAMETER OF STONE IN INCHES <br /> <br />PROTECTIVE STONE <br />GRADATION CURVES <br /> <br />FIG. 8 - GRADATI05 CURVES FOR STOllE <br /> <br />n-21 <br />