Re: Stainless Steel Spheres

[Bill Gottesman]

There have been several articles in the BSS Bulletin and the NASS compendium about spherical gnomons.  In BSS Bulletin 19.1 (March 2007) Chris Lusby Taylor wrote about how the sphere is a precise gnomon for a hours-to-sunset and hours-from-sunrise dial, because it is a special case for the more general cone gnomon.  Fabio Savian has created some wonderful dials along the same principles.  In these dial the shadow of the sphere does all the work, so it makes no difference whether or not the sphere is reflective. -Bill Gottesman Mike Cowham wrote: Dear Dialling Friends, I have just visited our local garden centre and they had a large quantity of 'Gazing Balls' on sale. These are 8" / 20cm diameter stainless steel spheres with no obvious seams or stalks, and with a mirror finish. They MUST be of use to many of you for dialling, for making globes or for ????? They are made by Gardman and they were selling two for £9.99, quite a bargain.  If any of you have ideas how these can be used in dialling, I will be pleased to hear from you. If you make something from them, I am sure that we would all like to hear.   Have fun, Mike Cowham. --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial

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