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Mr. W. H. Barlow on the Pneumatic Action [Apr. 16, 



The diagrams are as follows : 

 Strength. 



Strength. 



Strengthen. 



Strengthen. 



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 down- 

 ward 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 myself, 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. 



