466 



ADAMS. 



diagrams in wliich the curved lines represent the gradation of the ?ands 

 and the broken line is an even grade line for the series of sieves used. 

 This gi'ade line runs from zero to 100 per cent on the 10 niesli sieve, 

 which sieve corresponds approximately to the one having the smallest 

 openings in the series used for stone and gravel. In order to ascertain 

 the percentage held on an}' given sieve the amount indicated as passing 

 the sieve should be subtracted from 100. 



90 



s k. 



\ ^ 60 



C: ki 



kj i' 50 

 >i Q 40 



^^ .. 



10 













/ 



^ 



y^ 













/ 





^ -^ 













/ 





/ 

















.^ 

















/ 















^ 











,/ 







/ 











/ 



/ 



y 











/ 



- 











-___^ 



/ 















MILLIMETERS 



MESHES TO INCH 9««>'o*'^ cm ^ 



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



Fig. 2. — Geanulaemeteic Analysis of Pasig Sand Dipped Up in Baskets. 



There is a large amount of fine-grained sand used in Manila on small 

 jobs. It is dipped up in baskets and loaded into baneas by native divers. 

 This sand is sometimes called banca sand. An analysis of some of it is 

 shown in fig. 2. It will be seen that only 1 per cent is held on the 

 20-mesh sieve, but 5 per cent is held on the 30-mesh sieve, and the 

 percentage passing the 100-mesh sieve is 3.6. 



PERCENTAGE BY WEIGHT 

 PASSING DIFFERENT SIEVES 

















^^^ 

















^^^^^ 

















^,^-^^ - " 















y 



/ " 

















/ 













^ 



yy" ^ 













/ 





^' 











/ 



// 



^ 











/ 



Y 











^;;:,_— 





/ 













MILLIMETERS - ■ ■ - 



OOOOOO O o 

 MESHES TO INCH gwio'o*'^ rt 



SIZE OF OPENINGS IN MILL/METERS AND NUMBER OF MESHES TO THE INCH 



Pig. 3. — Geanulaemeteic Analysis of Pasig Sand Obtained by Deedging. 



