Of course a steel gnomon securely fastened would be harder to break off. Of course you already know that people have suggested high-mounted vertical wall-dials. Of course, for those, for security, you wouldn't want one of those horizontal nodus-sticks. You'd want the usual downward-slanted gnomon.
We hear the good suggestion of the vandal-proofness of an analemmatic dial, but I prefer a dial whose construction-principle can be easily explained to anyone. You wouldn't want to try to explain the analemmatic's construction to anyone other than at least a very-interested secondary-school or pre-secondary-school student. Any non-declining flat-dial's construction-principle is easily-explained. That includes a horizontal dial, an equatorial-dial, a north or south vertical dial, or a north or south reclining (but not declining) dial. In fact, it should be mentioned that even a vertical-declining dial's hour-line construction can be derived and explained without spherical trig or spherical co-oridinate transformations. (...though declination-lines for it would still require them). Michael Ossipoff Week 40, Friday September 27th 1050 UTC On Thu, Sep 26, 2019 at 4:00 AM Dan-George Uza <cerculdest...@gmail.com> wrote: > Hello, > > Horizontal sundials are often victims of vandalism. I am looking for ideas > or designs of gnomons which are not that easy to break off i.e. how to > attach them permanently to the base plate. Can you help? > > Thanks, > > -- > Dan-George Uza > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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