File:Transactions (1871) (14597332739).jpg

Identifier: transactionsmining36amer (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

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of the former becomes clogged with dirt, despite all efforts toprevent it.) The shaker or mud screen, C, consists of three screens,the top one being 27 by 6 ft., and the two others, 20 by 6 ft. invol. xxxvi.—36 02O aW O Wm <P-i o < Q CO 6 618 ANTHRACITE-WASHERIES. area. The screens are driven by eccentrics, set so that eachone receives a thrust at a different time from the others, an ar-rangement which is necessary in order to avoid undue vibrationof the framing. As soon as the material strikes the top screen,it is sprayed with water from a perforated pipe; and, passingdown the screen, goes under a box from which a copious streamof water overflows. For the first 21 ft., the top screen has
Text Appearing After Image:
—14- »K- a- H< 7- K H— - -*rf- Fig. 4.—Capouse Washery ; Transverse Section. 1.5-in. round holes, through which the chestnut and smallersizes pass to the screen below. Following the 1.5-in. roundholes are angle-irons, having the angle uppermost (A); thelower edges being 0.75 in. apart, which allows flat pieces ofslate to fall through. The last 4 ft. of the top screen has 2-in.round holes which permit pieces the size of stove-coal to fallthrough to a chute; pieces larger than 2 in. pass over the endof the screen to another chute. The stove-coal goes to jigs, D, ANTHRACITE-WASHERIES. 619 thence to rolls, E and F; and, after being broken to pea-sizeand smaller, to the main elevator-boot, A. The large coal is hand-picked by six men and boys and theslate removed, after which it is sent to the rolls and the mainelevators. The coal that drops through the top screen of theshaker, 0, falls on to the second screen having ;-in. holes, thechestnut-size passing over, and pea- and smaller

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