"The sudden expansion of the heated air along the path of the discharge affects our ears just as does the sudden expansion of the air at the mouth of a gun when it is fired. In each case a wave is sent through the air in all directions from the place of disturbance, and our ear-drums are set in vibration. That is thunder."
Take courage then, you timid ones, who wince in the lightning's flash and tremble under the thunder's roll. Thunder is simply a vibration of your ear drums—and, when you hear the thunder, be assured, all danger is over.
Editor
The Mentor Association
ESTABLISHED FOR THE DEVELOPMENT OF A POPULAR INTEREST
IN ART, LITERATURE, SCIENCE, HISTORY, NATURE, AND TRAVEL
