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Wind powered sundial Wheatstone polarizing dial with dipleidoscope Civil time ring (bracelet) dial PowerPoint Presentation
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Wind powered sundial Wheatstone polarizing dial with dipleidoscope Civil time ring (bracelet) dial

Wind powered sundial Wheatstone polarizing dial with dipleidoscope Civil time ring (bracelet) dial

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Wind powered sundial Wheatstone polarizing dial with dipleidoscope Civil time ring (bracelet) dial

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  1. NASS Convention, 2010Six New Dials I Would Like to Make, or Like for You to Make, or Like for Us to Make Together.-Bill Gottesman

  2. Wind powered sundial • Wheatstone polarizing dial with dipleidoscope • Civil time ring (bracelet) dial • Vercasson’s Foster Lambert dial • Ozanam map dial • Hologram dial

  3. A cone whose vertex angle is twice your latitude can be used to make a dial that reads hours from sunrise and hours to sunset. Sundial in Genk, Belgium

  4. HSS dial

  5. HSS vs Horiz dial

  6. HSS/HSREllipse

  7. Spiral and vanes

  8. Conic Sections

  9. Wind powered sundial • Wheatstone polarizing dial with dipleidoscope • Civil time ring (bracelet) dial • Vercasson’s Foster Lambert dial • Ozanam map dial • Hologram dial

  10. Wheatstone Polarizing Dial (invented ~ 1848)

  11. Scattered light is polarized

  12. Polarized Sky

  13. So What?

  14. Lets build a modern polarizing sundial(adapted from Bradley Schaefer’s polarization sundial article in Sky and Telescope, May 1997) • Camera Lens Polarizer (linear, not circular as for digital cameras) • ½ wave retarder film

  15. In use, the sunlight first passes through the half-wave film, and then the polarizer. “Sandwich” doesn’t work if it is flipped over. Cement film between polarizer and glass window(use clear epoxy or UV optical adhesive)

  16. Using Scope

  17. Models

  18. Dent

  19. Retroreflector

  20. Retroreflector 90b

  21. 180-2alpha

  22. start

  23. rotation

  24. Back to start

  25. movement

  26. mirror

  27. mirror

  28. eye

  29. Not aligned

  30. aligned

  31. photo1

  32. Retro sun

  33. Front sun

  34. Both suns

  35. Dipleidoscope may cause some vignetting

  36. Wind powered sundial • Wheatstone polarizing dial with dipleidoscope • Civil time ring (bracelet) dial • Vercasson’s Foster Lambert dial • Ozanam map dial • Hologram dial

  37. Bracelet Dial Images from UK National Maritime Museum website

  38. All read local, not civil, time. • No currently available ring dials are latitude specific. • Scale is confusing • Morning and afternoon hours on same hour line • Dates are typically Zodiacal, if at all. • Takes some dexterity to suspend and read at same time. • But it is a great piece of jewelry! Being specific to location it tells the recipient “only for you.”

  39. Lets build a ring dial

  40. (Afternoon example)

  41. (Afternoon example) Altitude 26 degreesWinter Solstice

  42. Suspend ring dial by pivot, not string or chain link

  43. Wind powered sundial • Wheatstone polarizing dial with dipleidoscope • Civil time ring (bracelet) dial • Vercasson’s Foster Lambert dial • Ozanam map dial • Hologram dial

  44. Fixed Gnomon Foster Lambert Dial(Michel Vercasson, Compendium March 2010)

  45. FL1