Inclined Plane Clock

Silver champlevé dial of the drum-shaped case is calibrated 2x I-XII, and the foliate engraved gilt center is signed Andreas Kraus, Schweidnitz, 127. The silver pointer is in the form of Minerva. The ebonized inclined plane has a scroll-pierced safety terminal and a thumbscrew for adjusting the inclination. The drum travels down the plane, and the escapement is impulsed by the weight concealed in the drum. A plaque is inscribed in Latin that reads Pereunt et Imputantur Horae. This translates to "The hours pass by and are taken into account." This quotation is adapted from a line in a poem by Roman poet Martial (40–c.103 AD).

Rolling ball and inclined plane clocks were experiments using gravity as a motive force for timepieces.