Poggendorf, Johann Christian, a German physicist and chemist, born at Hamburg; professor of Physics at Berlin; was the editor for more than half a century of the famous Annalen der Physik und Chimie, and the author of numerous papers (1796‒1877).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Poet's Corner * Poggio, Bracciolini