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Book IV

William Gilbert

Start reading Book IV

  1. Chapter 1: ON VARIATION.
  2. Chapter 2: That the variation is caused by the inæquality of the
  3. Chapter 3: The variation in any one place
  4. Chapter 4: The arc of variation is not changed equally
  5. Chapter 5: An island in Ocean does not change the variation, as
  6. Chapter 6: That variation and direction arise from the disponent
  7. Chapter 7: Why the variation from that lateral cause is not
  8. Chapter 8: On the construction of the common mariners'
  9. Chapter 9: Whether the terrestrial longitude can be found from
  10. Chapter 10: Why in various places near the pole the variations
  11. Chapter 11: Cardan's error when he seeks the distance of the
  12. Chapter 12: On the finding of the amount of variation: how great
  13. Chapter 13: The observations of variation by seamen vary, for the
  14. Chapter 14: On the variation under the æquinoctial line,
  15. Chapter 15: The variation of the magnetick needle in the great
  16. Chapter 16: On the variation in Nova Zembla.
  17. Chapter 17: Variation in the Pacifick Ocean.
  18. Chapter 18: On the variation in the Mediterranean Sea.
  19. Chapter 19: The variation in the interior of large
  20. Chapter 20: Variation in the Eastern Ocean.
  21. Chapter 21: How the deviation of the versorium is augmented and