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Hilde T. Himmelweit, A. N. Oppenheim and Pamela Vince: Television and the Child. London: Published for the Nuffield Foundation by Oxford University Press, 1958. Pp. xix+522. 42s.
A double ratio bridge is described, with which it is possible to measure loss tangents from 0.001 to 10 and permittivities from 1 to 30 over frequencies extending from 10−3 to 2×104c/s. The… (More)