Transcript 6 Dials I Would Like to See Made

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