The New Physics

Galileo's World at a Glance | Gallery at the Exhibit Website
Location: Bizzell Memorial Library, 5th floor Exhibit Hall.
Introductory video
How did Galileo create a mathematical physics?

In 1638, Galileo published his masterwork of physics, Discourse on Two New Sciences. The two sciences were tensile strength and mechanics, the study of machines in motion. Instead of basing physics on logic and qualitative principles, Galileo exemplified a new experimental and mathematical approach to physics. With Newton’s mathematical physics the following generation, this approach would transform understanding of motion and even of the universe itself.

“Philosophy (i.e., physics) is written in that great book which ever lies before our eyes — I mean the universe — but we cannot understand it if we do not first learn the language and grasp the symbols, in which it is written. This book is written in the mathematical language, and the symbols are triangles, circles and other geometrical figures, without whose help it is impossible to comprehend a single word of it; without which one wanders in vain through a dark labyrinth.” Galileo Galilei, Il Saggiatore (The Assayer, 1623)

Section 1: Machines in Motion

Scientist-engineers of the 16th century debated the theoretical principles of machines in motion. Ancient sources included a treatise on mechanics attributed to Aristotle; the mathematical methods of Archimedes; and Hero of Alexandria’s analysis of five simple machines: the lever, pulley, wheel, wedge and screw. The design of large-scale, complex machines drew attention to weaknesses in existing theoretical frameworks which Galileo resolved in his new science of motion.

1. Euclid, Preclarissimus liber elementorum (Venice, 1482), "Elements of Geometry"
2. Nasir ad-Din al-Tusi, Kitab tahrir usul l-Uqlidus (Rome, 1594), "Euclid's Elements of Geometry"
3. Niccolo Tartaglia, Euclide (Venice, 1543), "Euclide"
4. Christoph Clavius, Euclidis elementorum (Rome, 1589), 2 vols, "Euclid's Elements of Geometry, 2 vols., 1 and 2
5. Bernardino Baldi, In mechanica Aristotelis problema exercitationes (Mainz, 1621), "Problems and Exercises in Aristotle's Mechanics"
6. Archimedes, Opera (1543), "Works"
7. Apollonius, Conicorum (Oxford, 1710), "On Conic Sections"
8. Bonaventura Cavalieri, Lo Specchio Ustorio (Bologna, 1632), "The Burning Mirror"
9. John Philoponos, In posteriora resolutoria Aristotelis Comentaria (Venice, 1504), "Commentary on Aristotle's Posterior Analytics"
10. Simon Stevin, Les Oeuvres Mathematiques (Leiden, 1634), "Mathematical Works"
11. Luca Valerio, De centro gravitatis solidorum (Bologna, 1661), "On the Center of Gravity of Solids"
12. Guidobaldo del Monte, Perspectivae (Pesaro, 1600), "On Perspective"
13. Guidobaldo del Monte, Mechanicorum (Pisa, 1577), "On Mechanics"
14. Marin Mersenne, Les Mechaniques du Sieur Galilée (Paris, 1634), "Galileo, Mechanics"
15. Galileo, Mathematical Discourses (London, 1730), trans. Thomas Weston
16. Inclined plane, crafted by Ron Mitchell (University of Oklahoma Libraries, 2015).
17. Nobutoyo, Yahon Hiden, “Book of the Arrow” (ca. 1846). Manuscript copy by Hajime Terai from 1556 original written by Nobutoyo, illustrations copied by Odani
18. Nobutoyo, Koto no sho, “Book of Leggings” (ca. 1846). Manuscript copy by Hajime Terai from 1556 original written by Nobutoyo, illustrations copied by Odani
19. Ise, Heizo Sadatake, Kasakake zenki, “Secret Book of Hunger for the Target” (ca. 1846). Manuscript copy by Hajime Terai from original written in 1758 by Ise; illustrations copied by Odani
20. Ise, Heizo Sadatake, Fuku (no) Sho, “Secret Book of the Quiver” (ca. 1846). Manuscript copy by Hajime Terai from original written in 1765 by Ise; illustrations copied by Odani.
21. Paul E. Klopsteg Collection of the History and Technology of Archery, miscellaneous items.

Section 2: The Universe

Galileo was one of a generation of mathematicians who believed they understood physics better than the physicists. Physicists, then trained in logical methods, understood neither the theoretical basis of mechanics nor the tradition of mathematical astronomy which they regarded as hypothetical and uncertain. A generation after Galileo, the new mathematical approach to physics triumphed in Newton’s Principia, or Mathematical Principles of Natural Philosophy, which unified physics with the mathematical study of the universe.

22. Plato, Diuus Plato (Venice, 1491), ed. Marsilio Ficino, "The Divine Plato"
23. Aristotle, Opera Graece (Venice,1495-1498), 5 vols. bound in 6, "Works in Greek" (vol. 1, 2, 3a, 3b, 4, 5)
24. Aristarchus, De magnitudinibus et distantiis solis, et lunae (Pesaro, 1572), "On the Sizes and Distances of the Sun and Moon"
25. Proclus, Sphaera (Vienna, 1511), "On the Sphere"
26. Al-Qabisi, Alchabitius cum commento (Venice, 1512), "Commentary on Al-Qabisi"
27. Abraham bar Hiyya, Sphaera mundi (Basel, 1546), "On the Sphere of the Universe"
28. Sacrobosco, De Sphaera (Venice, 1490), "On the Sphere"; with Georg Peurbach, Theoricae novae planetarum, "New Theory of the Planets"
29. Sacrobosco, De sphaera (Wittenberg, 1545), "On the Sphere” 30. Francesco Barozzi, Cosmographia (Venice, 1585), "Cosmography"
31. William Gilbert, De magnete (London, 1600), "On the Magnet"
32. René Descartes, Principia philosophiae (Amsterdam, 1644), "Principles of Philosophy"
33. Fontenelle, Conversations on the Plurality of Worlds (London, 1728)
34. Isaac Newton, Philosophiae naturalis principia mathematica (London, 1687), "Mathematical Principles of Natural Philosophy"
35. Francesco Algarotti, Il Newtonianismo per le dame (Naples, 1737), "Newtonianism for Women"
36. James Bradley, “An Account of a New Discovered Motion of the Fix’d Stars,” Philosophical Transactions of the Royal Society of London (London, 1729), no. 406, pp. 637-660
37. Wilhelm Bessel, “De motu proprio stellarum fixarum” (1827); reprinted in Abhandlungen von Friedrich Wilhelm Bessel (Leipzig, 1875), "On the Proper Motion of Fixed Stars"
38. Léon Foucault, “Démonstration Physique du Mouvement de la Rotation de la Terre,” Comptes Rendus (Paris, 1851), pp. 135ff, "Physical Demonstration of the Rotational Movement of the Earth"
39. Albert Einstein: The Centenary of General Relativity, 1915-2015, miscellaneous items

Further reading:
  • Galileo, Dialogue on the Two Chief World Systems, trans. Stillman Drake (Modern Library, 2001).
  • John L. Heilbronn, Galileo (Oxford, 2010).
  • Stillman Drake, Galileo at Work: His Scientific Biography (Chicago, 1978).
Curators: Kerry Magruder and Brent Purkaple. Links are to the exhibit website, For more information, download the comprehensive, free Exhibit Guide from the iBook Store. Open Educational Resources are available at and ShareOK.