THE LOGOGKAPH, OK WHITING BY THE VOICE. 28 R 
becomes difficult against a pressure of 2 inches of water, and I 
could not pronounce any words against a pressure of 4 inches 
without considerable exertion# 
The following diagrams made by the instrument show the 
degree of accordance obtained when the same words are repeated 
by the same speaker : — 
Experimental Tests. 
Recording Instrument. 
Repetition Trials. 
: One of the first features manifested in using the instrument 
is the action produced by the silent discharge of air from the 
mouth, after a syllable or word or a sentence is pronounced. 
This silent discharge appears to depend on the force required 
in the last syllable, if more than one are consecutively uttered, 
and is most developed in those syllables terminating with the 
Consonants termed 66 Explodents,” whether with or without the 
silent vowel E after them* This effect is exhibited in fig. 1., 
]|>age 282. 
