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Saturday, July 12, 2008

Reading List: The Electric Life of Michael Faraday

Hirshfeld, Alan. The Electric Life of Michael Faraday. New York: Walker and Company, 2006. ISBN 978-0-8027-1470-1.
Of post-Enlightenment societies, one of the most rigidly structured by class and tradition was that of Great Britain. Those aspiring to the life of the mind were overwhelmingly the well-born, educated in the classics at Oxford or Cambridge, with the wealth and leisure to pursue their interests on their own. The career of Michael Faraday stands as a monument to what can be accomplished, even in such a stultifying system, by the pure power of intellect, dogged persistence, relentless rationality, humility, endless fascination with the intricacies of creation, and confidence that it was ultimately knowable through clever investigation.

Faraday was born in 1791, the third child of a blacksmith who had migrated to London earlier that year in search of better prospects, which he never found due to fragile health. In his childhood, Faraday's family occasionally got along only thanks to the charity of members of the fundamentalist church to which they belonged. At age 14, Faraday was apprenticed to a French émigré bookbinder, setting himself on the path to a tradesman's career. But Faraday, while almost entirely unschooled, knew how to read, and read he did—as many of the books which passed through the binder's shop as he could manage. As with many who read widely, Faraday eventually came across a book that changed his life, The Improvement of the Mind by Isaac Watts, and from the pragmatic and inspirational advice in that volume, along with the experimental approach to science he learned from Jane Marcet's Conversations in Chemistry, Faraday developed his own philosophy of scientific investigation and began to do his own experiments with humble apparatus in the bookbinder's shop.

Faraday seemed to be on a trajectory which would frustrate his curiosity forever amongst the hammers, glue, and stitches of bookbindery when, thanks to his assiduous note-taking at science lectures, his employer passing on his notes, and a providential vacancy, he found himself hired as the assistant to the eminent Humphry Davy at the Royal Institution in London. Learning chemistry and the emerging field of electrochemistry at the side of the master, he developed the empirical experimental approach which would inform all of his subsequent work.

Faraday originally existed very much in Davy's shadow, even serving as his personal valet as well as scientific assistant on an extended tour of the Continent, but slowly (and over Davy's opposition) rose to become a Fellow of the Royal Institution and director of its laboratory. Seeking to shore up the shaky finances of the Institution, in 1827 he launched the Friday Evening Discourses, public lectures on a multitude of scientific topics by Faraday and other eminent scientists, which he would continue to supervise until 1862.

Although trained as a chemist, and having made his reputation in that field, his electrochemical investigations with Davy had planted in his mind the idea that electricity was not a curious phenomenon demonstrated in public lectures involving mysterious “fluids”, but an essential component in understanding the behaviour of matter. In 1831, he turned his methodical experimental attention to the relationship between electricity and magnetism, and within months had discovered electromagnetic induction: that an electric current was induced in a conductor only by a changing magnetic field: the principle used by every electrical generator and transformer in use today. He built the first dynamo, using a spinning copper disc between the poles of a strong magnet, and thereby demonstrated the conversion of mechanical energy into electricity for the first time. Faraday's methodical, indefatigable investigations, failures along with successes, were chronicled in a series of papers eventually collected into the volume Experimental Researches in Electricity, which is considered to be one of the best narratives ever written of science as it is done.

Knowing little mathematics, Faraday expressed the concepts he discovered in elegant prose. His philosophy of science presaged that of Karl Popper and the positivists of the next century—he considered all theories as tentative, advocated continued testing of existing theories in an effort to falsify them and thereby discover new science beyond them, and he had no use whatsoever for the unobservable: he detested concepts such as “action at a distance”, which he considered mystical obfuscation. If some action occurred, there must be some physical mechanism which causes it, and this led him to formulate what we would now call field theory: that physical lines of force extend from electrically charged objects and magnets through apparently empty space, and it is the interaction of objects with these lines of force which produces the various effects he had investigated. This flew in the face of the scientific consensus of the time, and while universally admired for his experimental prowess, many regarded Faraday's wordy arguments as verging on the work of a crank. It wasn't until 1857 that the ageing Faraday made the acquaintance of the young James Clerk Maxwell, who had sent him a copy of a paper in which Maxwell made his first attempt to express Faraday's lines of force in rigorous mathematical form. By 1864 Maxwell had refined his model into his monumental field theory, which demonstrated that light was simply a manifestation of the electromagnetic field, something that Faraday had long suspected (he wrote repeatedly of “ray-vibrations”) but had been unable to prove.

The publication of Maxwell's theory marked a great inflection point between the old physics of Faraday and the new, emerging, highly mathematical style of Maxwell and his successors. While discovering the mechanism through experiment was everything to Faraday, correctly describing the behaviour and correctly predicting the outcome of experiments with a set of equations was all that mattered in the new style, which made no effort to explain why the equations worked. As Heinrich Hertz said, “Maxwell's theory is Maxwell's equations” (p. 190). Michael Faraday lived in an era in which a humble-born person with no formal education or knowledge of advanced mathematics could, purely through intelligence, assiduous self-study, clever and tireless experimentation with simple apparatus he made with his own hands, make fundamental discoveries about the universe and rise to the top rank of scientists. Those days are now forever gone, and while we now know vastly more than those of Faraday's time, one also feels we've lost something. Aldous Huxley once remarked, “Even if I could be Shakespeare, I think I should still choose to be Faraday.” This book is an excellent way to appreciate how science felt when it was all new and mysterious, acquaint yourself with one of the most admirable characters in its history, and understand why Huxley felt as he did.

Posted at July 12, 2008 21:01