Retaining walls; their design and construction . elaborate to warrant anabstract of them here. It might seem offhand that there is no practical occupation tothe method. Certainly, the very considerable labor involvedin counting 125,000 sand grams for one sieve group alone woulddeter anjone from contemplating such a program for practical. c D E FSand Letfer Fig. 122.— Capt. Edwards method of surface areas. (From Eiujincering AewsRecord, Aug. 15, 1918, p. 317.) work, if such a count had to be made very often. However,Captain Edwards points out that this elaborate counting isrequired only as a pr
Retaining walls; their design and construction . elaborate to warrant anabstract of them here. It might seem offhand that there is no practical occupation tothe method. Certainly, the very considerable labor involvedin counting 125,000 sand grams for one sieve group alone woulddeter anjone from contemplating such a program for practical. c D E FSand Letfer Fig. 122.— Capt. Edwards method of surface areas. (From Eiujincering AewsRecord, Aug. 15, 1918, p. 317.) work, if such a count had to be made very often. However,Captain Edwards points out that this elaborate counting isrequired only as a preUminary to his method and once done neednot be rci)cated. He sa^s: The adaptation of the surface area method of proportioning mortarsand concretes to both laboratory investigation and field construction CONCRETE CONSTRUCTION 223 operation presents no serious difficulty. The outstanding feature ofthis method, insofar as its practical application is concerned, is the im-portance of knowing the granulometric composition of the securing of this all important information involves a comparativelysmall amount of labor and by way of equipment the use of only the nec-essary scales, standard sieves and screens. The time element involvedis comparatively negligible, since the computation work of determiningareas and quantiti
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