2. GYRATORY CRUSHERS
At the turn of the century the largest Gates crusher, the No. 9, had a receiving opening of 21 x 48 in. with a threearm spider and a 21 x 80in. opening with a twoarm spider. The steam shovel began to change the entire picture of open pit quarrying. As a result of the use of steam shovels around 19 10 crushen