File:Transactions (1871) (14776729715).jpg

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

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nverted plunger c, whichcarries three breaking-heads e, at different levels (this plungersuccessively detaches the three pigs from the sow and breaksthem in the center); and (4) the vertical inverted cylinder?*,the plunger of which breaks the overhanging portion of thesow. The vertical cylinders are counter-balanced, so that theirplungers rise to their highest position, when pressure is cut off.The four cylinders are operated by one man. The bed is placed THE HANDLING OF MATERIAL AT THE BLAST-FURNACE. 31 by the overhead traveling-crane, or by an auxiliary jib-crane,with the front end resting on frame a, while the rear end issupported by truck h. The pawls feed it to the breaker untilthe entire bed is broken. The pieces of iron slide down an in-clined apron u, to the wagon placed below the breaker. Themachine does very good work. At the time of my visit onlytwo furnaces were in operation, producing together about 400to 450 tons of iron per day. It was reported that four men on Fig. 15.
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American Bank Note Co., N.T. Thomas Charging-Apparatus ; Arrangements for Dumping at Tunnel Head. each turn did all the work on the two casting-floors. Twomen and two boys, on day-turn only, handled, broke and loadedthe entire product. The handling of the iron in units of beds,weighing from 2; to 3 tons, instead of pigs weighing from 70to 120 pounds, is undoubtedly a step in the right direction. As improvements in the method of dealing with the iron,two auxiliary machines for opening and closing the tap-hole de-serve special mention. 32 THE HANDLING OF MATERIAL AT THE BLAST-FURNACE. The tap-hole drill, a pneumatic rock-drill, guided by a strongframe and fed by a pneumatic cylinder, has been described bythe inventor, Mr. David Baker, in the Transactions for 1892,vol. xxi., page 588. The tap-hole closing-machine, invented byMr. Samuel Vaughen, is shown by Fig. 27, in the form in whichit is used by the Maryland Steel Company. It consists of apneumatic cylinder controlled by a plain side-

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