V. The Modern Period, 1789–1914 > B. The French Revolution and Europe, 1789–1914 > 4. Western and Central Europe, 1815–1848 > a. Social, Cultural, and Economic Trends > 4. Science and Learning > b. Chemistry, Biology, and Geology > 1847

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The Encyclopedia of World History.  2001.

1847
Carl Ludwig (1816–95) perfected the kymograph, which became an invaluable measuring instrument for physiology. (See Science and Learning)	1

The Encyclopedia of World History, Sixth edition. Peter N. Stearns, general editor. Copyright © 2001 by Houghton Mifflin Company. Maps by Mary Reilly, copyright © 2001 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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