For an unbalanced rotor, amplitudes of vibration are given for different rates of constant angular acceleration and deceleration. The setup used to obtain these results on the differential analyzer at the Massachusetts Institute of Technology is described briefly and shown diagrammatically. The selection of spring constant, damping, and mass of suspended unit as a means of avoiding serious vibration in bringing a heavily unbalanced spring-mounted rotor up to speed is discussed in connection with the results.

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