E/MJ: Engineering und Mining Journal. Wichtige Pumpen am Standort Athensmine, Negaunee, Mich. und es wird jetzt gelegt aduplicate der ersten Pumpe, beide Geräte in beenbuilt vom Prescott Co. von Menominee, Mich jeder dieser Pumpen hat eine Kapazität von 500 gal. pro minuteagainst Eine vertikale Kopf von 2.400 ft., und der Druck dueto, Kopf, statische und Reibung, ist ungefähr 1.150 Mining Journal Vol. 108, Nr. 11 Qualität der Materialien, die über withinrecent Jahren damit zu rechnen ist, dass es in nodifficulty erfolgreich Pumpen von Wasser gegen jede werden. Einige tiefe -

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E/MJ : engineering and mining journal . portant pumping plant at its Athensmine, Negaunee, Mich., and there is now being placed aduplicate of the first pump, both equipments having beenbuilt by the Prescott Co. of Menominee, Mich. Each ofthese pumps has a capacity of 500 gal. per minuteagainst a vertical head of 2, 400 ft., and the pressure dueto that head, static and friction, is approximately 1, 150 Mining Journal Vol. 108, No. 11 quality of materials which have come about withinrecent years it is anticipated that there will be nodifficulty in successfully pumping water against any .SOME DEEP-MINE PUMPS IN THE LAKE SUPERIOR IRON DISTRICTS Company Gal. per Min. Ft. of Head McKinney Steel Co 1, 250 1, 000 Cleveland-Cliffs Iron Co 1, 000 1, 100 Montreal .Mining Co 300 1, 350 Oliver Iron Mining Co. (three) 400 1, 700 Newport Mining Co 400 1, 950 McKinney Steel Co 350 2, 050 Cleveland-Cliffs Iron Co. (two) 500 2. -tOO increased head that the mines may develop, and thatat a lower cost than was possible under older prevail-ing conditions.. ONE OF THE TWO 50D-G.A.L. PUMPS AT THE ATHENS MINE. NEGAUNEE, MICH. lb. per sq.in. At other mines water has been pumpedfrom greater depths, but it has always been shambled ori-elayed from one pump to another at different levels.In this instance the water is delivered from the bottomof the mine to the surface in one lift. The pumps are electrically driven, and each isoperated by means of n 400-hp. motor, the power beingtransmitted through single-reduction sets of doublehelical gears commonly known as the herring-bonetype. The use of these gears is of distinct advantagein that a greatly increased mechanical efficiency isobtained and high ratios of reduction are permissiblebetween gear and pinion. The pumps themselves areof the duplex, double-acting plunger type, and theentire water ends are of steel. Several deep-mine pumps have recently been builtfor service in the iron districts and show that thetendency is toward deeper mining. A few years agos

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