Arnold Hill Payne, 1911 Encyclopædia Britannica (1911)
“ The signs—as they are to the deaf—made by the vocal organs are entirely arbitrary, and have not even a fraction of the redeeming feature of naturalness which oralists demand in ordinary gestures. (4) Circumstances, such as light, position of the speaker, &c., must be favourable for the lip-reading to approach certainty. (5) Styles of speech vary, and it is a constant experience that even pupils who comparatively easily read their teacher’s lips, to whose style of utterance they are accustomed, fail to read other people’s lips. ”
