Dan - I forgot to add that I second John Picard’s recommendation for the classic Hughes and Rowe book although more recent innovations such as ceramic coatings are more recent. –Tom Kreyche
From: sundial <sundial-boun...@uni-koeln.de <mailto:sundial-boun...@uni-koeln.de> > On Behalf Of Dan-George Uza Sent: Saturday, April 30, 2022 8:55 AM To: Sundial List <sundial@uni-koeln.de <mailto:sundial@uni-koeln.de> > Subject: Metal gnomons Hi, Iron rusts and brass changes color, but what about different metals used as gnomons, pros & cons? What would be the appropriate choice of material for a replica of an 18th century cubical multiple sundial? It should ideally come as an industrial sheet ready for cutting and also not stain the limestone face. I like the metal in the attached photo (Sundial Atlas CH 000247). Do you know what it is? Thanks, Dan Uza
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