Engineering and Contracting . feet of gravel lifted per minute Cubic yards of gravel washed per miners inch (giant) Grade of sluice, inches in 12 feet 7 Operating cost per cubic yard, not including administration, cents 8 At the Logan mine, near Waldo, Ore., with 40 cu. ft. ofwater a second, 15,000 to 30,000 cu. yd. of gravel is washedper month. Four giants are used, two in the pit and twoon the tailings dump. A 20-in. hydraulic elevator withtwo lifts elevates the material 49 ft. The gravel is easilywashed, there are no large bowlders, and the operating ex-penses are said to
Engineering and Contracting . feet of gravel lifted per minute Cubic yards of gravel washed per miners inch (giant) Grade of sluice, inches in 12 feet 7 Operating cost per cubic yard, not including administration, cents 8 At the Logan mine, near Waldo, Ore., with 40 cu. ft. ofwater a second, 15,000 to 30,000 cu. yd. of gravel is washedper month. Four giants are used, two in the pit and twoon the tailings dump. A 20-in. hydraulic elevator withtwo lifts elevates the material 49 ft. The gravel is easilywashed, there are no large bowlders, and the operating ex-penses are said to be only 3s ct. per cubic yard, underexceedingly favorable conditions. 341 TELPHER SYSTEM FOR DISPOSING OF EXCA-VATED MATERIAL. The United States Realty & Improvement Co., NewYork City, is using an interesting type of telepher sys-tem for handling excavated materiiil from its subway con-struction contracts. The accompanying halftones showthe plants installed at 28th St. and 7th Ave, and 13th 7th New York station at 28tli St. and 7th Ave., New York City. The power for hoisting and trolleying is performed bya 250-volt direct current A Lidgerwood2-drum hoist is used for hoisting and trolleying. The caris a home-made affair, composed of four standard castiron wheels 8-in. in diameter, which run on two 18-in.
Size: 1913px × 1307px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
