Air Currents in Michigan Copper Mines Timbering Caves
Engineer J J Jackson of Houghton reports on timbering in Michigan copper mines and the air currents associated with underground cave ins. He notes Calumet & Hecla and Tamarack use extensive timbering, explains how caving generates air blasts, and discusses shocks near Quincy. He compares deep mine settlement to shallow coal mine fissures and warns of potential surface effects from deep-seated cave ins.
MENTIONED IN THIS ARTICLE
Western Society of Engineers
Chicago
J. J. Jackson
Houghton
Michigan
Tie
Quincy
Ralumet & Hecla
Calumet & Hlecla
Calumet & Hecla
Tamarack
Steel Shares and Steel Industry Market Update
United States Steel reports a slight quarterly decline tied to the New York building trades strike and ongoing car shortages. Despite this, the firm remains financially strong and attractive at current prices, with preferred stock yielding around g percent. Iron ore markets show unsettled forge and foundry pig iron and barely steady Bessemer iron as buyers wait for lower quotes amid a declining market. Structural steel projects face labor dispute settlements and postposed undertakings, while wage scales move toward arbitration. Merchant steel and pipe demand remains solid with large contracts under negotiation and rail equipment selling well. Southern iron furnaces and steel billets feel coal miner strikes but expect swift settlement.
MENTIONED IN THIS ARTICLE
United States Steel Corporation
New York
Great Corporation
Bessemer
Dittsburgberg
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