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NASS Convention, 2010 Six New Dials I Would Like to Make, or Like for You to Make, or Like for Us to Make Together. -Bill Gottesman •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Vercasson’s Foster Lambert dial •Ozanam map dial •Hologram dial 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 HSS dial HSS vs Horiz dial HSS/HSR Ellipse Spiral and vanes Conic Sections •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Vercasson’s Foster Lambert dial •Ozanam map dial •Hologram dial Wheatstone Polarizing Dial (invented ~ 1848) Scattered light is polarized Polarized Sky So What? Lets build a modern polarizing sundial • Camera Lens Polarizer (linear, not circular as for digital cameras) • ½ wave retarder film (adapted from Bradley Schaefer’s polarization sundial article in Sky and Telescope, May 1997) In use, the sunlight first passes through Cement the half-wave film, film and then the polarizer. between “Sandwich” doesn’t polarizer work if it is flipped and over. glass window (use clear epoxy or UV optical adhesive) Using Scope Models Dent Retroreflector Retroreflector 90b 180-2alpha start rotation Back to start movement mirror mirror eye Not aligned aligned photo1 Retro sun Front sun Both suns Dipleidoscope may cause some vignetting •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Vercasson’s Foster Lambert dial •Ozanam map dial •Hologram dial Bracelet Dial Images from UK National Maritime Museum website •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.” Lets build a ring dial (Afternoon example) (Afternoon example) Altitude 26 degrees Winter Solstice Suspend ring dial by pivot, not string or chain link •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Vercasson’s Foster Lambert dial •Ozanam map dial •Hologram dial Fixed Gnomon Foster Lambert Dial (Michel Vercasson, Compendium March 2010) FL1 FL2 FL1 again FL3 FL1 again Pin FL6 Hour Movement Motto 1 Motto 2 Paint calendar on undersurface of glass and place thin adhesive Teflon spacers under hidden areas Stack Cylinder •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Vercasson’s Foster Lambert dial •Ozanam map dial (1673) •Hologram dial •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Ozanam map dial •Hologram dial oz2 12 oz3 12 oz4 12 oz5 12 oz6 12 oz7 12 oz8 12 oz9 12 oz10 12 oz11 12 oz12 12 oz13 oz13eot Ozanam Map Glass overlay •Wind powered sundial •Wheatstone polarizing dial with dipleidoscope •Civil time ring (bracelet) dial •Vercasson’s Foster Lambert dial •Ozanam map dial (1673) •Hologram dial Reflection Hologram Reflection Hologram Reflection Hologram Reflection Hologram Reflection Hologram (Gnomonless dial. Original idea by Ken Mills and John Perry) Questions? Wind Powered Ozanam Wheatstone Hologram Vercasson F.L. Civil Ring