Transactions (1871) (14590306347)

Identifier: transactionsmining27amer (find matches)

Title: Transactions

Year: 1871 (1870s)

Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers

Subjects: Mineral industries

Publisher: New York (etc.)

Contributing Library: Gerstein - University of Toronto

Digitizing Sponsor: University of Toronto

Text Appearing Before Image:

at Chi-cago, the work on each section will be briefly described. Section 0.—The top soil was removed by wheel scrapersloading from overhead inclined-plane platforms into cars drawnin trains by horses. A portion of the top-lift was also removedby steam-shovel, loading on to flat cars which were taken overthe Illinois Central R. R. to the lake-front improvement. Theremaining excavation was done with dipper dredges, deliveringinto bargee which were towed out into Lake Michigan anddumped at places where the water is not less than 50 feet deep.The efficiency of the dredges is 600 cubic yards per day, at acost of about 12 cents per cubic yard. Section N.—The top-lift, to the depth of about 5 feet, was re- THE CHICAGO MAIN DRAINAGE CHANNEL. 299 moved in trains of P.etler cars loaded by wheel scrapers, dump-ing from a raised platform through a trap. These cars werealso loaded by hand-labor, pick-and-shovel method. At thepresent time, the remaining excavation is being made with the Fig. 6.

Text Appearing After Image:

ERICAN BANK NOTE CO. N.y. Chicago Drainage District and Main Drainage Channel. steam-shovel, incline and tipple method, as used by the Iieiden-reich Co. on Sections L and M. Sections L and M.—These two sections were worked as one,the Heidenreich Co. having the contract for both. The top-soil, to the depth of from 5 to 7 feet, was removed largely bywheel scrapers, New Era graders and dump-cars. The re-mainder of the material was taken out with steam-shovels andincline-conveyors (see Fig. 8). The excavation was made Ion- 300 THE CHICAGO MAIN DRAINAGE CHANNEL. gitudinally and in two lifts of 20 feet each. The average out-put was 750 to 800 cubic yards per day, at a cost of about 11cents per cubic yard. Sections land K.-While the main excavatmg-plant was be-ing installed, the removal of the top-soil to an average depth of5 feet from the entire surface of the two sections was effectedwith New Era graders and wheel scrapers. In this manner,during a period of five months, nearly 475,000 cu

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1871

University of Toronto

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