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We left the big primary gyratories back among the misty memories of the first Word War. As a matter of fact, there is not a great deal more to tell so far as these machines are concerned, except for one more big jump in reached a 48-in. receiving opening by 1910 and 54-in shortly thereafter, was developed a few years later into the 60-in. size.
Our own first 60-in. machines were built in 1926-27, and these crushers-two of which were installed in a South American copper mine –set a world record in weight and proportions which still stands. These giant machines, weighing about 500 tons each, and rearing their steel frames to the height of a two-story building, are indeed a long step forward from the first tiny N° 2 Gates crusher that came out of the little shop on Randolph Street in Chicago some 60-odd years ago.
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