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OF UNDULATIONS.-Origin of Undula-
tions-Progressive and Stationary
Undulation-Course of a Progressive
Wave-Nodal Points-Three dif-
ferent kinds of Vibration-Trans-
verse Vibration of a Cord-Vibrations
of Rods-Vibrations of Elastic Planes
-Vibrations of Liquids-Waves on
Water-Law of the Reflection of
Undulations-Applied in the case of
a Plane, a Circle, an Ellipse, a Para-
bola-Case of a Circular Wave on a
Plane-Interference of Waves-In-
flection of Waves Intensity of
Waves-Method of Combining Sys-
tems of Waves
1
CHAPTER XXXII.
PRODUCTION OF SOUND. -The Note
depends on Frequency of Vibration
-Distinguishing Powers of the Ear
96
100
104
107
Soniferous Media Origin of
Sounds in the Air-Elasticity re-
quired and given in the Case of
Strings by Stretching-Rate of Ve-
locity of Sounds-All Sounds trans-
mitted with Equal Speed-Distances
determined by it-High and Low
Sounds-Three Directions of Vibra-
tion-Intensity of Sound-Quality
of Sounds-The Diatonic Scale .. 113