. American engineer and railroad journal . pole shoe to the magnet frame. The importantconsideration of heat radiation is further aided Dy the simpleexpedient of casting the magnet frame with a central aperturethrough which air may freely circulate. This prevents the for-mation of a pocket of dead air in the concave under face of themagnet, and in addition to forming a ventilating flue, reducesthe weight of the magnet. Lifting magnets of large size, designed for use with pig iron,scrap, etc., are made concave on the under side, because this formis best for handling large numbers of irregular s
. American engineer and railroad journal . pole shoe to the magnet frame. The importantconsideration of heat radiation is further aided Dy the simpleexpedient of casting the magnet frame with a central aperturethrough which air may freely circulate. This prevents the for-mation of a pocket of dead air in the concave under face of themagnet, and in addition to forming a ventilating flue, reducesthe weight of the magnet. Lifting magnets of large size, designed for use with pig iron,scrap, etc., are made concave on the under side, because this formis best for handling large numbers of irregular shaped piecesof metal at a single lift. When, however, the load consists ofingots or other large objects with plane surfaces, this concavitybecomes objectionable, since an air gap intervenes between theinner pole and the object to be lifted. The above mentionedcentral aperture in the magnets makes it possible to convertthem in a few moments from concave faced magnets into mag-nets adapted for handling large masses of metal with plane sur-. *CH MAGNET LIFTING AN 8oO LB. BLISS ELECTRIC CAR LIGHTINGGENERATOR. IO-INCH MAGNET HANDLING TANK HEADS. faces. This is accomplished by inserting in the central aper-ture an auxiliary pole piece so proportioned as to extend theinner pole downward to the level of the outer pole, thus elim-inating the air gap and insuring intimate contact of both poleswith the object to be lifted. The pole shoes, which are of course subjected to the greatestwear and tear, are removable, and can readily be replaced whennecessary. An improved form of terminal box has been adopted,consisting of a solid casting, doing away with the projectinghandle formerly used, which was liable to breakage. The newbox is also water tight. When the circuit is suddenly opened on a magnet coil thereis a strong inductive reaction, or kick. the effect of which isto induce a high voltage at the terminals of the coil. Constantrepetitions of this kick will sooner or later break down thestr
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
