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money for the laboratory of the Royal 

 Institution, Faraday began giving a se- 

 ries of public lectures. The so-called 

 Friday Discourses (which continue to 

 this day) featured many of the notable 

 scientists of the era: John Dalton, Lord 

 Kelvin, Charles Lyell. But Faraday set 

 the standard for clarity and showman- 

 ship. "It waked the young from their 

 visions and the old from their dreams," 

 gushed an admirer. Part of his success 

 with the public stemmed from his 

 memorable demonstrations of the lat- 

 est discoveries. He detonated a hydro- 

 gen-filled balloon with an electric 

 spark. He made his hair stand on end 

 with a static-electricity generator. His 

 favorite appearances, though, were the 

 annual Christmas lectures he gave to 

 children. No less a figure than Charles 

 Dickens found them so impressive that 

 he implored Faraday to turn them into 

 an instructional book for children. 



Yet for all of Faraday's brilliance in 

 the laboratory and the lecture hall, 

 many of his colleagues dicin't know 

 what to make of him. Untutored in 

 mathematics, he could not express his 

 results in the abstract notation expected 

 by scholars. In his later years he devel- 

 oped an elaborate theory of electricity 

 and magnetism based on invisible "lines 

 of force" emanating from charged 

 atoms. The theory was so visual, so 

 based on imagery, that he was widely 

 viewed as loony, or at least past his 

 prime. Ultimately James Clerk Max- 

 well cast Faraday's geometrical ideas 

 about lines of force into the mathe- 

 matical framework now known as field 

 theory — one of the underpinnings of 

 electromagnetism, gravitation, and 

 quantum mechanics. Faraday's theory 

 turned out to be as self-descriptive as it 

 was precocious: his own field of influ- 

 ence, like that of an electrically charged 

 body, extended outward, effectively 

 without limit. 



Laurence A. Marschall, author of The 

 Supernova Story, is IVK.T. Sahm Professor 

 of Physics at Gettysburg College in Pennsylva- 

 nia, ami director of Project CLEA, which pro- 

 duces widely used simulation software for edu- 

 cation in astronomy. 



66 NATURAl HISTORY April 2006 



