p.s. Since these neodymium magnets are so strong, if they are too big, they may break the glass before falling off! I'm guessing that the magnetic bonding force is directly proportional to the area of the flat face of a disk magnet. The bigger the magnet, the more its bonding force. You might want to use a smaller size neodymium magnet with a gnomon for glass
-----Original Message----- From: Mike Shaw [mailto:[email protected]] Sent: Tuesday, January 04, 2011 4:29 PM To: John Carmichael Cc: Sundial List Subject: Re: Glass on Glass Mosaic Indoor Sundial Windows John Nobody has mentioned double glazing yet. I assume that you don't bother with that in Arizona. Will the magnets still be OK to use through two thicknesses of glass with an air space between? Mike Shaw 53.37N 3.02W www.wiz.to/sundials --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
