468 



ADAMS. 



PERCENTAGE BY WEIGHT 

 PASSING DIFFERENT SIEVES 







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MILUMCTERS - - 

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SIZE OF OPENINGS IN MILLIMETERS AND NUMBER OF MESHES TO THE INCH 



Fig. 6. — GEANULAnMETRic Analysis of Sangley Point Sand. 



There is a considerable percentage of coarse material in the Sangley 

 Point sand which consists of decomposed pebbles and shells and shell 

 fragments. In fig. 6 it is seen that there is 16 per cent of this coarse 

 material, 41 jicr cent held on a 20-mesh sieve, 54 per cent on a 30-mesh, 

 and 7 per cent passing a 100-mesh sieve. Accordingly the sand contains 

 an objectionable amount of coarse material, consisting of broken shells 

 and also considerable dii't. 



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SIZE OF OPENINGS IN MILLIMETERS AND NUMBER OF MESHES TO THE INCH 



Pig. 7. — Granulaemeteic Analy'sis of Oeani Sand. 



The analysis shovi^n in fig. 7 indicates 13 per cent of fine gravel, 30.5 

 j)er cent held on a 30-mesh sieve, 56 per cent held on a 30-mesli and 

 3 per cent passing a 100-mesh. The Orani sand contains coarse sharp 

 grains and very little fine material and practicallv no sliell fragments. 



