. Electrical world. FIG. 2.—DREDGE WORKING S.\ND PILE. ated at a normal speed of 22 buckets per minute. The dredge willdig from 50,000 to 75,000 cubic yards of material per month. Thereare some dredges using a 3;2-cubic-foot bucket which will not ex-ceed 50,000 cubic yards per month. The standard dredge, however,uses the 5-foot bucket. This dredge has a hull about 36 by 90 feeton the water line, with a draft of 5 feet. It is fitted with two spuds—one wood, 50 feet long, weighing about 10 tons; one steel, 50 feetlong, weighing about 17 tons. The swing permits of a cut about90 feet in width. The
. Electrical world. FIG. 2.—DREDGE WORKING S.\ND PILE. ated at a normal speed of 22 buckets per minute. The dredge willdig from 50,000 to 75,000 cubic yards of material per month. Thereare some dredges using a 3;2-cubic-foot bucket which will not ex-ceed 50,000 cubic yards per month. The standard dredge, however,uses the 5-foot bucket. This dredge has a hull about 36 by 90 feeton the water line, with a draft of 5 feet. It is fitted with two spuds—one wood, 50 feet long, weighing about 10 tons; one steel, 50 feetlong, weighing about 17 tons. The swing permits of a cut about90 feet in width. The bucket line can be run continuously on anypoint of the controller from the third notch to full speed. Thestacker is 30 inches wide and about go feet long. .\ number of other successful installations equipped by the Gen-. FIG. 3.—BUCKET LIXE. eral Electric Company on these lines could be mentioned. Amongthem are plants for the Yuba Consolidated Dredging Company, theFolsom Development Company, the Boston & Oroville Gold Dredg-ing Company, the Oroville Gold Dredging & Exploration Company,the El Oro Gold Dredging Company, and the Ashburton MiningCompany. There are now about 40 dredgers working in Californiawith more to come. Portable Voltage and Series Transformers. The ordinary equipment for making electrical measurementsaffords chances for error which care cannot always overcome. It isfrequently impossible to have at command instruments of all the capacities required to give the best results. Readings should betaken well within the range of the instruments, upon the portion ofthe scale where the divisions are large and open and errors in obser-vation not likely to occur. Even when instruments of all the desiredranges are at hand, it is still often difficult to obtain absolute accu-racy and uni
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
