Catalog of Sites and Images


Don't Panic

The sites/images are mainly those of/from Wikipedia.


  1. Alphabetic Listing
  2. Lecture Listing

  1. Alphabetic Listing

    1. Images.

    2. Albert Einstein (1879--1955) Images.

    3. alternator Images.

    4. Ampere balance (AKA current balance) Images.

    5. Ampere's law Images.

    6. aurora Images and animations.

    7. Avogadro's number Images.

    8. bird migration Images.

    9. Biot-Savart law Images.

    10. brush (electrical) Images.

    11. carbon-14 Images.

    12. commutator Images and animations.

    13. compass Images.

    14. compressed-air energy storage Images.
      This could be the way of the future.

    15. cosmic rays Images.

    16. cross product Images.

    17. diple Images and animations.
      See also magnetic dipole.

    18. Dracula (circa 1400--) Images. Formulator of the Dracula principle: ``It's always daylight somewhere in the world.

    19. dynamo theory of Earth's magnetic field No images.

    20. Earth's magnetic field Images.

    21. Earth's magnetic field Images.
      To compute the magnetic field and its components see NOAA: National Geophysical Data Center: Compute Earth's Magnetic Field Values.

    22. eddy current Images.

    23. eddy current brake Images.

    24. electric arc Images.

    25. electric generator Images.

    26. electric motor Images. There is a nifty film of a nanomotor.

      1. electric motor 1.
      2. electric motor 2.

    27. electrical power transmission Images.

    28. electrical steel No images.

    29. electromagnet Images.

    30. electromagnetism No images to speak of.

    31. Faraday's law of induction Images.

    32. ferromagnetism Images.

    33. field line Images.

    34. flux linkage No images. But yes linked flux must mean more or less what I thought it did, though it seems to be mostly used for coils.

    35. Gian Domenico Romagnosi (1761--1835) Images.
      An early investigator of electromagnetism.

    36. gyroradius or cyclotron radius No images.

    37. Hall effect Images. It was discovered by American physicist Edwin Hall (1855-1938) in 1879.

    38. Hans Christian Oersted (1777--1851) Images.

    39. high-voltage direct current No images.

    40. hydropower Images. A good cartoon of water turbine.

    41. inductance Images, formulae, tables.

    42. induction cooker Images.

    43. iron Images.

    44. iron filings Images.

    45. James Clerk Maxwell (1831--1879) Images.

    46. Joseph Henry (1797--1878) Images.

    47. Kirchhoff's circuit laws Images.

    48. LC circuit Images. These are essential ingredients in electronic oscillators, electronic filters, and electronic tuners (used e.g., for radios).

    49. lodestone Images.

    50. Lorentz force Images.

    51. Magnesia No images.

    52. magnet Images.
      See also How do magnets work? especially for the electronic structure of iron. See also Calvert's Iron, but it's still elusive on whether orbital angular momentum contributes to a magnetic-field-causing current.

    53. magnetar Images.

    54. magnetic core Images. See also magnetic materials and soft iron.

    55. magnetic declination Images and animations.

    56. magnetic domain Images.

    57. magnetic field Images. For various field strengths, see the perhaps out-of-date links below.

      1. Table of Magnet Strengths Images.
      2. National High Magnetic Field Laboratory in Florida. Has strongest sustainable magnet of 45 T.
      3. Record laboratory non-destructive field about 100 T.
      4. Strongest Magnets Table.

    58. magnetic moment Images.

    59. magnetic pole definition No images.
      A north pole is a region from which magnetic field lines diverge and a south pole is a region to which magnetic field lines converge. This is think is the best general definition.

    60. magnetic resonance imagining Images.

    61. magnetism Images.

    62. magnetite (lodestone) Images.

    63. magnetosphere Images.

    64. magnetostriction Images.

    65. magnetometer Images. Gaussmeter for something on small magnet field strength.

    66. mass spectrometry Images.

    67. Maxwell's equations No images, but there are equations.

    68. Michael Faraday (1791--1867) Images.

    69. Nikola Tesla (1856--1943) Images. He has even been in fiction The Invention of Everything Else by Samantha Hunt (2008).

    70. North Magnetic Pole Images. The north magnetic pole is actually a magnetic south pole.

    71. permeability Images.

    72. Peter of Maricourt (fl. 1269) Images.
      Early investigator of magnetism and the compass.

    73. radiometric dating No images.

    74. rare earth element Images.

    75. rare-earth magnet Images.
      See also neodymium magnet and Indigo Instruments: Rare Earth Magnets.

    76. railgun Images.

    77. refrigerator magnet Images.

    78. right-hand rule Images.

    79. Solar Power Grand Plan Zweibel et al. 2008, Scientific American, January, p. 64.

    80. solar prominence Images.

    81. solenoid Images.

    82. South Magnetic Pole No images. The south magnetic pole is actually a magnetic north pole.

    83. Structure of the Earth Images.

    84. Sun Images.

    85. terrella Images.

    86. Them! Images.
      Speaking as a physicist, I've no object to giant ants and glowing dogs.

    87. tokamak Images.

    88. transformer Images.

    89. Van Allen radiation belts Images.

    90. War of Currents Images.

    91. vacuum permeability No images.

    92. watt balance Images.

    93. William Gilbert (1544--1603) Images.

  2. Lecture Listing

    1. magnetite (lodestone) Images.

        Magnetism is everywhere in nature, but it's harder to notice electricity where static electricity and lightning are obvious electrical phenomena---but it took Ben Franklin (1706--1790) to show that they were the same thing.

        Humankind early on in prehistory encountered magnetism from natural magnetic materials. But this was only in limited geographical areas. So probably only a few in prehistory knew of it.

        The most obvious one is magnetite which is the strongest naturally occurring magnetic materials.

        It will attract iron and other magnetic materials---or repel depending on cases.

        In magnetic history, Aristotle (384--322 BCE) says Thales (circa 620--540 BCE) gave a scientific description of magnetism, and this is probably the first scientific description.

        In the China, the first literary mention of magnetism was in the Book of the Devil Valley Master presumably written by the Devil Valley Master.

    2. rare-earth magnet Images. See also neodymium magnet and Indigo Instruments: Rare Earth Magnets.

    3. aurora Images and animations.

        Then there were the aurora mostly near the polar regions---but who knew that they were partially magnetic phenomena.

    4. Earth's magnetic field Images.

    5. magnetic declination Images and animations.

    6. North Magnetic Pole Images. The north magnetic pole is actually a magnetic south pole.

    7. South Magnetic Pole No images. The south magnetic pole is actually a magnetic north pole.

    8. compass Images.

    9. Peter of Maricourt (fl. 1269) Images.

        He gave the first detailed description of the compass.

    10. William Gilbert (1544--1603) Images.

        He was the first to argue that Earth was a giant magnet.

        He invented the terrella to demonstrate how this could be.

    11. Gian Domenico Romagnosi Images.

    12. Hans Christian Oersted (1777--1851) Images.

    13. Faraday's law of induction Images.

    14. Joseph Henry (1797--1878) Images.

    15. iron filings Images.

    16. James Clerk Maxwell (1831--1879) Images.

    17. Albert Einstein (1879--1955) Images.

    18. refrigerator magnet Images.

        There is an inventor: William Zimmer----why didn't he call them zimmers.