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--- Begin Message ---Another possible solution (but not speaking from experience) would be a Shadow Plane dial, which can be either horizontal or vertical. So long as the dial and gnomon fixing are robust, the only potential weakness is the ligature gnomon, depending upon material used. Steel cable would be vandal-proof but not user-friendly, stout cord would have to be replaced occasionally, but not expensive. The Shadow Plane Dial is best explained in the NASS Compendium article by Maddux, Oglesby & Fer de Vries - Vol. 6 No. 3, September 1999
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