Good thought, Larry! Make the tether long enough to drop the gnomon below the dial...
Dave Sent from my iPhone On Jan 9, 2011, at 12:21 PM, "Larry Bohlayer / Celestial Products" <[email protected]> wrote: > John, > > Here are some thoughts on additions to your design for the magnetic gnomon: > > 1.) a “keyed” mounting shape would help keep it from rotating out of > alignment. > 2.) a short tether (chain or wire) to prevent loss/damage to the gnomon. > One of the issues related to using a tether would be a lose gnomon swinging > in the wind and doing damage to the glass and/or gnomon. > > Larry > > Larry Bohlayer > Celestial Products > 608 Coral Bells Ct. > Concord, NC 28027 > Office 540-338-4040, Fax 704-973-7799 > Customer Service Order Line 800-235-3783 > > [email protected] > www.celestialproducts.com > From: [email protected] [mailto:[email protected]] On > Behalf Of John Carmichael > Sent: Sunday, January 09, 2011 12:57 AM > To: 'Sundial List' > Subject: Magnetic Gnomon (design 1) > > Since a picture is worth a thousand words, here is a drawing of my magnetic > gnomon design that I hope to use on the new stained glass window. > To avoid glass cracking and breakage from an impact, the gnomon is held onto > the sundial face with two magnets. One magnet is a round 1/16" thick, 1” > diameter disk located in the stained glass window. It is held in place in the > by soldered lead came. > See: www.kjmagnetics.com/proddetail.asp?prod=DX01 > Next to it is an identical brass disk with a hole in it. A small 10mm wide > mounting magnet sits in the hole. The hole in the brass disk keeps the > mounting magnet from sliding around. It is also held in place by the lead > came. > See: www.kjmagnetics.com/proddetail.asp?prod=MM-D-10 > > A threaded brass rod gnomon is screwed into the mounting magnet. > > If something bumps into the gnomon, it will fall off and the glass and the > gnomon won’t get damaged. > > Installation is simple, and no nuts and bolts are required! > > I am conducting tests on this design for possible use on the stained glass > sundial that I'm making. > > See: http://www.flickr.com/photos/jlcarmichael/5338306840/ > > Note: The actual gnomon will have a brass frog soldered to the brass rod. > But I left this out of the drawing to keep it simple. > > > > John L. Carmichael > Sundial Sculptures > 925 E. Foothills Dr. > Tucson AZ 85718-4716 > USA > Tel: 520-6961709 > Email: [email protected] > > My Websites: > (business) Sundial Sculptures: http://www.sundialsculptures.com > (educational) Chinook Trail Sundial: > http://advanceassociates.com/Sundials/COSprings/ > (educational) Earth & Sky Equatorial Sundial: > http://advanceassociates.com/Sundials/Earth-Sky_Dial/ > (educational) My Painted Wall Sundial: > http://www.advanceassociates.com/WallDial > (educational) Painted Wall Sundials: > http://advanceassociates.com/WallDial/PWS_Home.html > (educational) Stained Glass Sundials: http://www.stainedglasssundials.com > (educational) Sundial Cupolas, Towers & Turrets: > http://StainedGlassSundials.com/CupolaSundial/index.html > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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