Amongst the general public he is most famous for the theory of gravitation (which … If, Hermes, you feel like I’ve been correcting your post thus far, it is because it is far too timid.
Well, it was just a Newtonmas Greeting. Numismatist Michael Hodder once said that I make my bones off the works of others, i.e, that I write reviews and summaries, as opposed to doing original work, like he does. Fair enough, it is true. My biography of Newton’s tenure as warden and master of the Mint (Numismatist, November 2001) came largely from the works of Sir John Craig.
- Sir John Craig, Newton at the Mint (Cambridge 1946).
- “Isaac Newton and the Counterfeiters” by Sir John Craig, Notes and Records, London: The Royal Society,
December 1, 1963, pages 136-145.
I also read the recent biographies by Berlinski, Westfall, and White:
- Berlinski, David. Newton’s Gift: How Sir Isaac Newton Unlocked the System of the World. New York: Free Press, Simon and Schuster, 2000.
- Westfall, Richard S. Never at Rest: a Biography of Isaac Newton. Cambridge: Cambridge University Press, 1980.
- White, Michael. Isaac Newton: The Last Sorceror. Reading, Mass.: Helix Books, Perseus Books, 1997.
When Levenson’s book came out (Newton and the Counterfeiter: The Unknown Detective Career of the World’s Greatest Scientist by Thomas Levenson; Boston;New York: Houghton Mifflin Harcourt, 2009), I revisited those and then found “Isaac Newton–Crime Investigator” by John Craig. Nature 182 (1958). So, I know Newton fairly well.
I agree that if you ran some kind of “person on the street” questionaire, you would find that “most” people would say that “Newton discovered gravity” or something like that. When I cited his three laws of motion, I was, in fact, thinking of the Second: “for every action, there is an equal and opposite reaction.” It comes up in Little League Baseball; it is fundamental to firearms training; ice skaters know that first, and then much more about conservation of energy on a frictionless surface.
Reading The Logical Leap, I went through all of that yet again. Newton’s telescope worked just fine, even though he was just plain wrong about light. You wisely wrote, “… and the realization that ‘white’ light is a broad spectrum (mixture) of all colors.” Close enough, but that is not exactly correct, as, in truth, it only takes three colors (not the full spectrum) to fool our brains into seeing the nonexistent wavelenght of “white.” (Unless you think “white” is out there somewhere beyond blue because the word “color” literally means “heat” and comes directly from our experience with iron: heat an iron rod and goes from red to white. Linguists have a rule of thumb that no language invents words for “brown” and “purple” until after the differentiation of “blue” from “green.” Seriously. Our Indo-European languages are only about 6,000 years old, with increasingly rapid development. Try reading Aristotle in the original Greek and you will not be impressed: compared to Ayn Rand, he’s Fred Flintstone – he lacks concepts, even though the Greeks were inventing new words all the time. “The Greeks have a word for it,” is a cliche from Roman times. In The Logical Leap, Harriman uses vernacular about color and about projectile motion. So, he never states explicitly that waves reflect as do particles with the angle of incidence equal to the angle of reflection; but waves refract according to Descartes’ Law (Snell’s Law to us): sin(i)/sin® = k. That disproves Newton’s corpuscular theory. The pressure of light can be demonstrated and that experiment casts doubt on the wave theory because the “pressure” of a wave is perpendicular to its direction of motion.
that it was one force, not two fundamentally different phenomena, was a paradigm-shifting revelation. Before Newton it was believed that the heavens were ruled by different physical laws (presumably god’s will) than things here on earth. Afterwards it appeared that even god was following set laws… which of course went a long way towards making atheism make sense to people looking at concretes as opposed to making abstract arguments.
Well, atheism was known before Newton - Francis Bacon alluded to it - and, again, in hacking through The Logical Leap, I discovered via other books that medieval astronomy was robust, a long sweep from the 800s through the 1400s, attempting to bring theory and measurement in to alignment. The Church was very supportive of astronomy (called “astrology” then) because getting Easter right required predicting the phases of the Moon relative to the position of the Sun – the first Sunday after the first full moon after the first day of Spring. There was one observatory in Gorze in Germany founded in 953 by a group of men and women who had been studying astrology at a school or monastary of some kind in Metz. So, I try to get past For the New Intellectual when speculating about who thought what in the Middle Ages. But, be all that as it may, it is true that Newton’s work made the Enlightenment possible: he brought theory and practice together in a clearly demonstrable set of principles.