16 



Mr. Daniel Jones 



[Feb. 9, 



tabbour on to a revolving mirror and thence on to the screen. The 

 virations of the taml)our membrane are then seen as carves on the 

 screen. 



Fig. 13.— Mouth-Teacings op (A) Fully-aspieated p > (B) 

 Paetially-aspieated p ; (C) Unaspieated p ; (D) Unvoiced b ; 

 AND (E) Fully- Voiced b — each followed by the vowel a. 



B 



Fig. 14. — Simultaneous Mouth- and Nose-Teacings of (A) 

 Feench plante (Female Voice) ; (B) English plant (Male Voice). 

 Note the absence of ii in French. 



[This experiment was performed, and the difi'erences in the effects 

 of various speech-sounds were shown. Special attention was called 



