His word of command is but a sound-wave in air, except as it is followed by labor.
In other words, the terms, "vibration" and "sound-wave," are synonymous.
The sunlight is for one sense and the sound-wave is for the other.
The sound-wave travels on the atmosphere, and preserves its integrity.
The sound-wave immediately produced a movement of the diaphragm, causing the stylus to make a mark on the record diagram.
A sound-wave consists essentially of two parts — a condensation and a rarefaction.
The result was that I saw a wave of compression, of the same sort as a sound-wave in air, move through the throng.
This puff of air is the sound-wave itself, travelling at the rate of eleven hundred feet or more per second.