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Dialogues Concerning Two New Sciences

Galileo Galilei

Henry Crew and Alfonso de Salvio (1914)

Galileo's Dialogues Concerning Two New Sciences (1638), written during his house arrest and given here in the Crew–de Salvio translation of 1914, is the founding work of modern physics and the science of materials. Cast as a four-day conversation among three interlocutors, it establishes the strength of materials as a mathematical science and, most momentously, the laws of motion—uniform and naturally accelerated motion, and the parabolic path of projectiles. By subjecting motion to geometry and experiment, Galileo laid the foundations on which Newton would build.

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Contents

1. First Day
2. Second Day
   1. Proposition I
   2. Proposition II
   3. Proposition III
   4. Proposition IV
   5. Proposition V
   6. Proposition VII
   7. Proposition VIII
3. Third Day
   1. Theorem I
   2. Theorem II
   3. Theorem III
   4. Theorem IV
   5. Theorem V
   6. Theorem VI
   7. Theorem I
   8. Theorem II
   9. Theorem III
   10. Theorem IV
   11. Theorem V
   12. Theorem VI
   13. Theorem VII
   14. Theorem VIII
   15. Theorem IX
   16. Theorem X
   17. Theorem XI
   18. Theorem XII
   19. Problem I
   20. Problem II
   21. Problem III
   22. Theorem XIII
   23. Problem IV
   24. Problem V
   25. Problem VI
   26. Problem VII
   27. Theorem XIV
   28. Problem VIII
   29. Problem IX
   30. Theorem XV
   31. Theorem XVI
   32. Problem X
   33. Theorem XVII
   34. Problem XI
   35. Theorem XVIII
   36. Theorem XIX
   37. Theorem XX
   38. Theorem XXI
   39. Problem XII
   40. Problem XIII
   41. Problem XIV
   42. Theorem XXII
   43. Problem XV
   44. Problem XVI
4. Fourth Day
   1. Theorem I
   2. Theorem II
   3. Theorem III
   4. Problem I
   5. Proposition V
   6. Proposition VI
   7. Proposition XIV
5. Appendix