Small-Sized Chushing Plants

Many small plants consisted of one crusher, either jaw or gyratory, one elevator and one screen. Recrushing, if done, was taken care of by the same machine handling the primary break. The single crusher, when of the gyratory type, might be any size from the N° 2 (6-in. opening) to the N°. 6 with 12-in. opening.

Plants Grow in Output

When demand grew beyond the capabilities of one crusher, it was generally a simple matter to add a second machine to take care of the recrushing or secondary crushing work. A popular combination, for example, consisted of a N°. 6 primary and a N°. 4 secondary, or possibly a 20- X 10-in., or 24- X 12-in. primary jaw, followed by one of the small gyratories. When the business outgrew the capacity of this sort of plant, it was not unusual to double up, either in the same building, or by erecting an entirely separate plant adjacent to the original one.

Crusher manufacturers were not standing still during these early years. In the gyratory line for example, the N° 2 was the first popular size, and larger machines were developed from time to time up to the N° 6, then the N°. 7 (later redesigned and called N° 71/2).

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