This series on Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This video (the fourth of four) shows how to operate the machine. Check out the series companion book and learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

This series on Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This bonus video shows the motion of every rocker arm -- that is, every sinusoid. The end of the video shows all the arms in motion together. Check out the series companion book and learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

This series on Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This videos shows the machine rotating and rotating -- including a breathtaking spiral up the machine at the end of the video. Check out the series companion book and learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

his series on Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This video is a page-by-page commentary to the series companion book. Learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

► Learn more at: http://www.engineerguy.com/fourier

► Buy the book on Amazon: http://www.amazon.com/gp/product/0983966176/

► Buy the posters on Zazzle: http://www.zazzle.com/engineerguy

► Main videos in the series:

(1/4) Introduction: https://www.youtube.com/watch?v=NAsM30MAHLg

(2/4) Synthesis: https://www.youtube.com/watch?v=8KmVDxkia_w

(4/4) Operation: https://www.youtube.com/watch?v=jfH-NbsmvD4

► Bonus videos:

Books and Posters: https://www.youtube.com/watch?v=YXgTwrblClQ

Page-by-Page: https://www.youtube.com/watch?v=rMHw9GCAtE8

Spinning Machine: https://www.youtube.com/watch?v=XPQwKRt4Y2k

Rocker Arms: https://www.youtube.com/watch?v=4mBuyixt22U

This series on Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This video (the third of four) shows how to use the machine to do Fourier analysis. Check out the series companion book and learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

This series on Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This video (the second of four) shows how to use the machine to do Fourier synthesis. Check out the series companion book and learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

This introduction to the series Albert Michelson’s Harmonic Analyzer celebrates a nineteenth century mechanical computer that performed Fourier analysis by using gears, springs and levers to calculate with sines and cosines—an astonishing feat in an age before electronic computers. This video is the first of four -- plus several bonus videos. Check out the series companion book and learn how to get a free PDF of the entire book at http://www.engineerguy.com/fourier.

Bill nominates, perhaps only provocatively, James Bosnack's cigarette machine as the invention with the greatest economic impact on the 20th century. Cigarettes, as compared to pipes and cigars, are and the most direct way to deliver nicotine to the brain. Bosnack's machine made the mass production of cigarettes possible. The use of cigarettes, of course, has taken a tremendous human and economic toll. (The quotations are from Tastes of Paradise by Wolfgang Shivelbusch published by Pantheon, New York, 1992.)

Bill explains how the rise of home air conditioning had to battle the open air movements in public school: They regarded it as only for factories where it was first introduced. Only when movie theatres added air conditioning in the 1930 and 1940s did it become popular for the home.

Bill tells the story of how George Eastman invented film. Its use in the Brownie camera revolutionized photography; that it changed the way American families think of themselves and recall their own histories.