Florida, Carolina del Sud e fosfati canadesi: Dando un resoconto completo del loro verificarsi, metodi e costo di produzione, quantities aumentato, e commerciale importanza. Ng Co. Limited nei giorni precedenti dell'industria una zona considerevole, dove l'acqua era bassa, è stato sfruttato a mano, il rockessendo inizialmente allentato da pick e crowbar. La roccia era sconvolta dai tuffatori, anche in acqua 20 piedi profondo ; e inWimbee Creek, all'inizio degli anni settanta, non era insolito vedere l'acqua affollata di neri, nuoto e immersioni, andvocifering lustitly, come hanno ondeggiato i loro attrezzi aroundth

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Florida, South Carolina, and Canadian phosphates: giving a complete account of their occurrence, methods and cost of production, quantitities raised, and commercial importance . ng Co. Limited In the earlier days of the industry a considerable area, where the water was low, was exploited by hand, the rockbeing first loosened by pick and crowbar. Rock was alsobrought up by divers, even in water twenty feet deep ; and inWimbee Creek, early in the seventies, it was not unusual tosee the water crowded with blacks, swimming and diving, andvociferating lustily, as they waved their implements aroundthem. Another method of raising rock—which can still beseen going on at the present day—is by the use of long tongs, which are manipulated from flat scows, capable of holdingabout four tons, two men operating from each scow. A verylarge force of men used to work in the above manner, and theCoosaw Company were at the time getting as much as three tofour hundred tons per day in this fashion. The general method, however, of mining the phosphate isby the use of dredges, though in one instance a 22-inchpump was unsuccessfully experimented with by the River andMarine Company.. South Carolina Phosphates. 161 There are 13 dredges at work at the present time in thevarious rivers and creeks. Of these eight arc of the dipper-dredge description. The machinery, which is fixed upon abarge, held in position by strong wooden spuds, consists of theusual boiler, hoisting engines with friction clutch, and enginesfor swinging the boom. The boom, usually constructed ofsteel, supports a long wooden handle, to which the bucket (withmassive steel teeth attached to the lower rim) is fastened.When at work the dipper handle is run out till the bucketreaches the bottom ; the bucket is then drawn forward andupwards by a strong chain running over the end of the boomand cuts its way into the stratum. When the bucket and dipperhandle are raised to the necessary elevation, a small chain, con-trolled by the ma

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• bookidfloridasouth
• bookyear1892