. Electrical world. workis done, the commutator is smooth and true. The apparatus is madeby Jordan Bros., of 74 Beekman Street, New York City. Massachusetts Technology at Niagara. The Western alumni of Massachusetts Institute of Technology willgo by special train to their great reunion at Boston this month anda visit to the electrical industries at Niagara Falls is to be given adav of the time en route. June ^, 1904. ELECTRICAL WORLD and ENGINEER. Motor-Driven Contractors Hoist. As an indication of the economy of electric motor drive in in-dustries temporary in character and also the adaptabil
. Electrical world. workis done, the commutator is smooth and true. The apparatus is madeby Jordan Bros., of 74 Beekman Street, New York City. Massachusetts Technology at Niagara. The Western alumni of Massachusetts Institute of Technology willgo by special train to their great reunion at Boston this month anda visit to the electrical industries at Niagara Falls is to be given adav of the time en route. June ^, 1904. ELECTRICAL WORLD and ENGINEER. Motor-Driven Contractors Hoist. As an indication of the economy of electric motor drive in in-dustries temporary in character and also the adaptability of Northerndirect-current apparatus the illustration below is of interest. Theequipment shown was installed by a contractor in a metropolitan city,to do away with the cost of installing steam hoisting for the trans-portation of material required in finishing a building. The cost ofcurrent for this work, in this instance, was 50 cents per day, asagainst a charge of $ to $ per day wages for an engineer for. using in this case a controller giving a range of twenty-one a portion of this range is used as working speeds, the entirerange of the tool being increased by a double back-gear attachmentwhich permits a total speed range of from 410 of the spindleto 5-75 With this entire range three runs of gearing are provided, onebeing direct and the other two through back gears. Each of thesevarious runs is controlled by a friction clutch, the lever for oper-ating which is located in front of the head stock. About 40 speedsare provided with hp, available at any speed between 20 and of the spindle. For the heaviest working range of the tool,however, namely, 28 to 124 , hp is available. The whole equipment is well laid out, the speed changes are ac-complished quickly and easily, and the strength of the motor andgearing is sufficient to accommodate cutting speeds in cast iron andsoft steel of 70 ft. per minute. One prominent featur
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
