Figure 53: Tablet dial
Figure 54: Tablet dial made in Nuremberg by Johann Gebhart in 1556
A tablet dial is made up of two small distinct sundials hinged together by a common gnomon. One is an ordinary horizontal dial and the other a vertical direct south dial, both sufficiently small in size so that when folded at the hinge, they can fit into the pocket. A tiny compass is embedded in the horizontal dial to align the gnomon to the north. A tiny plumb line is attached to the vertical dial to assure its verticality.