FLIGHT, January 8th, 1942. c

. . and the same dismantled to show its few and simple parts.

of this method of suspending the absorber mass, which is based on Salomon's "Duplex Suspension" patents, is that the motion of the absorber mass, under the action of vibratory torques transmitted from the crankshaft, is the same as the motion of a simple pendulum.

The absorber rings are retained in place by flanges on the pin and lock-ing bolt, the latter being secured by riveting over the end of the bolt after it has been screwed into position.

The tuning characteristics of the oscillating system were determined in accordance with the method des-cribed in the paper previously mentioned,* aj/d the theoretical predictions were fully confirmed by subse-quent tests. The illustration shows a series of records obtained from this engine by means of the R.A.E. re-

* See also W. Ker Wilson, " Practical Solution of Torsional Vibration Problems." Chapman and Hall, London.) Vol. 2, Second Edition, 19+1.

WITHOUT ABSORBERS

3 R a ORDER

PART 3 R D ORDER

PART 3 R D ORDER

5'/a ORDER

6 T H - ORDER

W I T H ABSORBERS

5