Abstract
MEASUREMENTS of the group height and sense of rotation of the polarization ellipse by Brunnschweiler1 in the swept frequency-range of 100–1,000 kc./s. have frequently displayed an interference pattern similar to those shown by the records of Fig. 1. This is an ordinary h′–f record to which has been added a sense of rotation indicator; corresponding to a dark trace, the echo polarization is a north into east rotation (N→E) while the light trace refers to the echo having a north into west rotation (N→W). Further details on the recorder design have been given by Carlson2.
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