Through animated drawings and photography explains the hypothesis that electricity consists of unit elementary charges. Demonstrates the conduction of electricity through solutions, gases, and vacuum: Faraday's laws; movement of charges in vacuum tubes: operation of photoelectric cells: and reproduction of sound on film. For high school and college groups.

A survey of U.S. history from 1800 to 1817. Highlights the inauguration of Thomas Jefferson, the Barbary War, the Louisiana Purchase, the Lewis and Clark expedition, and the War of 1812. From the Exploring series.

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