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BauernringDrecker. Skizze eines Bauernringes Hhensonnenuhr Anneau de paysan montre solaire kind of solar watch used in Europe in XVII century Book excerpt Joseph Drecker Theorie der Sonnenuhren Vereinigung Wissenschaftlicher Verleger Abb br or scan by Analemma in February Joseph Drecker nachbearbeitet von Analemma DreckerBauernring