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The steam shovel began to change the entire picture of open-pit working. With the steam shovel came the really “huge” N° 8 crusher, with its 10-in. receiving opening. Up to this time the jaw crusher had kept pace with the gyratory, both from the standpoint of receiving opening and capacity, but now the gyratory stepped into the leading position, which it held for some 15 years. Once the ice was broken, larger and larger sizes of the gyratory type were developed rapidly, relegating the once huge N° 8 machine to the status of a secondary crusher. This turn toward really large primary crushers started just a few years before the turn of the century, and in 1910 crushers with 48-in. receiving openings were being built. |
