Syria Publications of the Princeton University Archaeolog...
Butler, Howard Crosby Excerpt from Syria Publications of the Princeton University Archaeological, Expeditions to Syria: Geography and ItieraryThe instruments used were a prismatic compass, a twelve-inch theodolite with solar attachment, three specially selected Waltham watches, an aneroid barometer, and a boiling-point thermometer. The plan adopted in general was to keep a compass dead reckoning, assuming the pace to be an average of two and three-quarters miles pe...