Franklin had steadily extended his own knowledge by study of foreign languages, philosophy, and science. He repeated the experiments of other scientists and showed his usual practical bent by inventing such diverse things as the Franklin stove, bifocal eyeglasses, and a glass harmonica (which he called an armonica; see harmonica
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
See more Encyclopedia articles on: U.S. History: Biographies