Dialface ID 71
Abstract
A single hemisphere without central gnomon point, once had two separate gnomon points corresponding to the north and south facing halves of the dial face. The gnomon points were placed in the meridian plane so that the summer solstice of the south-facing surface virtually coincided with the winter solstice of the north-facing surface. Grids have been engraved on both the north and south facing halves of the hemispherical shadow-receiving surface of this dial. Since gnomon holes near the top edge may be associated with each dial grid, the hole in the bottom center of the hemisphere presumably served to drain off accumulated water.
Measurements
This object has not been measured by the 3D pipeline. Its entry in the catalogue rests on the published description only; no surface fit, latitude or line detection exists for it.
References
- – Diels, Herrmann, Antike Technik, Leipzig and Berlin, 1920, p. 165 ff.
- – Gibbs, Sharon L., Greek and Roman Sundials, New Haven and London, 1976, p. 68, p. 184f.
- – Rehm, Albert, Eine Zwillingssonnenuhr aus Pergamon, 1911, p. 251 ff.
- – Unver, A. Suheyl, Sur les Cadrans solaires horizontaux et verticaux en Turquie, 1954, figures 14 and 15 (photographs).
- – Jacobsthal, Paul, Dörpfeld, Wilhelm, Schazmann, Paul, Bericht über die Arbeiten zu Pergamon 1906-1907, 1908, p. 426.
- – Winter, Eva, Zeitzeichen. Zur Entwicklung und Verwendung antiker Zeitmesser, Berlin and Boston, 2013, p. 470.
- – Rehm, A., Zur sog. Zwillingssonnenuhr von Pergamon, 1915, p. 675ff.