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OF PAPER Most of the control devices which are required in a foundry do not differ very materially in their functions from control de vices in other industries. However, they have to encounter an unusual degree of dirt. Proper enclosing cases and the latest types of safety protection are advantageous. The crane re quires a special kind of control. The difference between alterna ting-current control and direct-current control is discussed and it is shown that for most cases, where cranes aredoi:10.1109/paiee.1915.6590306 fatcat:4s3vzp5fgjfrjeshdfj27mpb6e