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POPULAR SCIENCE REVIEW. 
The diagrams are as follows : — 
Strength. Strength. 
As a test of the rapidity of action of the instrument, I have 
used the old nursery words, “ Peter Piper picked a peck of 
pickled pepper.” 
This is said at the rate of six syllables per second ; and it 
will be observed that there are two principal upward and two 
principal downward movements to many of the syllables, besides 
other subsidiary actions. 
Peter Piper picked a peck of pickled pepper. 
Another curious test is the continuous sound of the rough R. 
The upper diagram is pronounced by'hnyself, the lower one by 
my son. 
There is a very marked difference in the quantity of air used 
and the degree of compression in different words and syllables. 
