To Support Moving Masses on To Isolate Vibration: The usual purpose of springs used to support moving or vibrating masses 4 is to eliminate or to reduce vibration or impact. Thus electric mo- tors are frequently spring supported to prevent the transmission of objectionable vibration to the foundation. Likewise, the springs used in automobile suspensions not only tend to mitigate shock due to irregularities in the road surface Point 1 but also pre- —Courtesy, Edgewater Steel Co. Similarly the springs on a railway car, Fig. An interesting application of the use of springs to support a vibrating mass is the tub support in an automatic washing machine, Fig.
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