The first exposition of conservation and its builders; an official history of the National conservation exposition, held at Knoxville, Tenn., in 1913 and of its forerunners, the Appalachian expositions of 1910-11, embracing a review of the conservation movement in the United States from its inception to the present time . ough in the earlier stages of min-ing such primitive methods as team and scraper or horse and dump cart wereused. The phosphate itself in the land pebble section is taken up almost entirely byhydraulics, being dumiied direct tO the washer. In the hard rock phosphate sec-tion
The first exposition of conservation and its builders; an official history of the National conservation exposition, held at Knoxville, Tenn., in 1913 and of its forerunners, the Appalachian expositions of 1910-11, embracing a review of the conservation movement in the United States from its inception to the present time . ough in the earlier stages of min-ing such primitive methods as team and scraper or horse and dump cart wereused. The phosphate itself in the land pebble section is taken up almost entirely byhydraulics, being dumiied direct tO the washer. In the hard rock phosphate sec-tion in the dry mines the phosphate is loaded on to tram cars l)y pick and shovel,these being drawn by cable to the washing plant. In the dredge mines the phos-])hate is lifted Iw dipper into the dump carts and it is then drawn by cal)le to thewasher. It is thus seen that all materials of the matrix is ])assed through thewashers. The washers in use are the revolving log washers in which tiie phosphate ispushed forward by steel blades meeting streams of water flowing from the upperend of the washer. In the process of washing, all of the finer materials of thematrix including the sane, clay particles, soft phos])hate and fine pel)l:)le phosphateare carried out with the waste. That there is a large amount of calcium phos-. UNDERWOOD TYPEWRITER EXHIBITWINNER OF GOLD MEDAL, NATIONAL CONSERVATION EXPOSITION. rnn pirst expo sir iox op isi pliate carried dul with the waste is well known. The ])h()S])hate discarded includesthe soft phosphate the ])hos])hatic clays and the \er\- line jiehhle phosphate. Theamount lost wiries in different mines and under different conditions. After reach-ing- the dum]) there is also more or less mechanical separatious of materials. Twosamples taken somewhat at random from the ]>hi)s])liate dumps in the hard rockregion showed u])on analysis and ])er cent calcium phosphate respec-tively. Two samples from the duni]) of a plate ph()S])h
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Keywords: ., bookauthorpinchotg, bookcentury1900, bookdecade1910, bookyear1914
