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Presents a study of phonetic factors in relation to accuracy of transmission of words in airplane noise. Statistical analysis of intelligibility test records made by aviation cadets; Study of preservation-in-error tendencies of speech sounds; Differences of sounds in words from sounds in nonsense syllables; Intelligibility in noise understood by the study of the preservation-in-error capacities of sounds; Need for increasing studies on the data on preservation-in-error values of sounds.

Examines a rating scale for public speakers. Traits of a successful public speaker; Information on the measure of success in public speaking; Conclusions.