Research and Test Apparatus

Two simple instruments for obtaining transient response from the frequency response in a vibrating system have been made available by Costain‐John Brown Ltd., Instrumentation Division, Roxby Place, Seagrave Road, Fulham, S.W.6. They consist respectively of Cosine and Sine cursors engraved on transparent plastic sheet, and are used in conjunction with special graph paper, on which the observed function is plotted. The method and its derivation arc described in a paper ‘An Approximate Method for obtaining Transient Reponse from Frequency Response’ by H. H. Roscnbrock, Proc. Inst. Elec. Engs., Vol. 102, Part B, No. 6, November 1955.