. Official proceedings . cky Mountains and the Wind RiverRange just east of the main range. The line is all single trackwith comparatively light traffic but will be equipped with electriclocomotives of about 3000 H. P. each of which twenty-oneengines for freight and passenger service are under construc-tion. Among the other large users of electric power are themodern steel mills. Mere very large motors are used. Whereordinary mills use aiotor^ of hnnsircds of horsepower, steel millsrequire them of thousavid? of horsepower. ^Motors have beeninstalled in some mills which can develop 8000 to
. Official proceedings . cky Mountains and the Wind RiverRange just east of the main range. The line is all single trackwith comparatively light traffic but will be equipped with electriclocomotives of about 3000 H. P. each of which twenty-oneengines for freight and passenger service are under construc-tion. Among the other large users of electric power are themodern steel mills. Mere very large motors are used. Whereordinary mills use aiotor^ of hnnsircds of horsepower, steel millsrequire them of thousavid? of horsepower. ^Motors have beeninstalled in some mills which can develop 8000 to H. hours at a time In some cases these motors are designedto take swings of from to H. P. for short periodsand can reverse from full speed in one direction to full speedin the opposite in from five to ten seconds. The induction motor has not itself the ideal characteristicsfor n-iany kinds of steel mill work but its adaptability for largeunits appears to outweigh all disadvantages in most cases. In. Westinghcuse Motor Generator Set Installed in the Plant of theHHnois Steel Co. Maximum Capacity 6500 Kw. 268 the reversino- mill its disadvantaj^vs ontweis^h its advantages sothat here it is simply used as a ])rinie mover for operating moresuitable types of generators and motors. In this case the induc-tion motor drives a large I^. C. generator, together with a f3ywheel attached to it for carrying the Rnctuations in load. ThisD. C. generator operates the roll motors. The regulating properties of this combination are such thatwhile the power for driving and reversing the rolls may varyfrom nothing to 10,000 or even H. P., the inductionmotor driving the set will take up an approximately constantload from the supply system. At light load the induction motor develops power which isstored in the fly wheel by speeding it up, while at peak loadthe fly wheel gives up this stored energy in parallel with thedriving motor. Thus this reversing mill work, while extr
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