I have a slate roof tile that I'm planning on etching/scratching ,or otherwise marking with a vertical dial face.
However, I have finished a horizontal dialface, using the ZONWPLT procedure available via NASS. The computer printout was then taken to an engraving shop, where a brass plate was photoengraved. The result of this effort was quite adequate, in my estimation. This is one facet of the sundial building process that I do not possess the time, money, or skills to pursue. The photoengraving process successfully etched very fine dashed lines (for 10 minute interval lines) nicely. I will be posting an article with images to the NASS compendium shortly regarding this effort. Good luck with your designing and building plans! John.
