Before the early 17th century, pocket watches were rare, unreliable, and too costly. Travelers who wanted to keep track of the time used an instrument like this, also called a Shepherd's Dial. The time of day was indicated by the sun's altitude. A fascinating, quality replica of a museum piece, the beech wood cylinder is hollow, like the original, so the two brass gnomons—long for winter, short for summer—can be stored inside when not in use. About 2 ½" diameter, 10" high.