. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . mber of the case of the pocket magnet theseinvisible lines of force are present allthe time, but when an electro-magnet isused, the lines form or disappear, as thecurrent flows or dies, and at a touch the innumerable stitches are there, or theyare gone, with the velocity of light the lifting magnet asby the Cutler-Hammer Clutch Com-pany of Milwaukee, Wis., consists of acircular case of cast iron or steel, inwhich is embedded a coil of copper. Ina general way the l
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . mber of the case of the pocket magnet theseinvisible lines of force are present allthe time, but when an electro-magnet isused, the lines form or disappear, as thecurrent flows or dies, and at a touch the innumerable stitches are there, or theyare gone, with the velocity of light the lifting magnet asby the Cutler-Hammer Clutch Com-pany of Milwaukee, Wis., consists of acircular case of cast iron or steel, inwhich is embedded a coil of copper. Ina general way the lifting magnet maybe likened to a spoked engine truckwheel with a steel tire. There is acentral hub with a hole through it likethe wheel hub bored out for the part or zone where the spokes ofthe wheel lie, is, in the magnet, occu-pied by the circular coil of copper,and the tire of the wheel correspondsto the protecting outer case of the castshell of the magnet. The face of themagnet, which is the lower surface, con-sists of a central ring of cast iron,about which lies a ring of brass hold-. THE 50-IN. LIFTING MAGNET. ing the coil in place, and beyond thatthere is an outer ring of cast iron. Theouter and inner rings of iron are calledthe outer and inner poles, and the brassring is called the coil shield. This brassring, being non-magnetic, compels the linesof force to form below the coil and tostretch across the gap which separates thepoles. The mushroom casting which formsthe body of the lifting magnet is coredout in the center like the hub of awheel. This opening forms a sort ofcentral flue which helps to carry offthe heat which is generated when thecoil is energized by the flow of theelectric current. The outer edge of thecasting is corrugated in order to pre-sent a larger heat radiating surface sothat the magnet, as a whole, may bekept cool. This is one of the features ofthe design, for other things being equal,the cooler the magnet can be kept, thegreater its effici
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
