John Carmichael raised an issue with me directly regarding the "un-artfulness" of a tether looping out beside the gnomon. He is correct. The simple (but additional work) solution would be to hide it inside the mount surrounding the magnet base by winding it around that base or it could be pushed up inside a hollow gnomon, if the gnomon design allowed.
Larry Bohlayer On January 9, 2011 Dave Bell 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 <mailto:[email protected]> [email protected] <http://www.celestialproducts.com> 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: <http://www.kjmagnetics.com/proddetail.asp?prod=DX01> 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: <http://www.kjmagnetics.com/proddetail.asp?prod=MM-D-10> 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/> 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: <mailto:[email protected]> [email protected] My Websites: (business) Sundial Sculptures: <http://www.sundialsculptures.com/> http://www.sundialsculptures.com (educational) Chinook Trail Sundial: <http://advanceassociates.com/Sundials/COSprings/> http://advanceassociates.com/Sundials/COSprings/ (educational) Earth & Sky Equatorial Sundial: <http://advanceassociates.com/Sundials/Earth-Sky_Dial/> http://advanceassociates.com/Sundials/Earth-Sky_Dial/ (educational) My Painted Wall Sundial: <http://www.advanceassociates.com/WallDial> http://www.advanceassociates.com/WallDial (educational) Painted Wall Sundials: <http://advanceassociates.com/WallDial/PWS_Home.html> http://advanceassociates.com/WallDial/PWS_Home.html (educational) Stained Glass Sundials: <http://www.stainedglasssundials.com/> http://www.stainedglasssundials.com (educational) Sundial Cupolas, Towers & Turrets: <http://stainedglasssundials.com/CupolaSundial/index.html> http://StainedGlassSundials.com/CupolaSundial/index.html --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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