Lenticle On a clock’s case, a lenticle is a (usually) lens-shaped glass panel that allows one to see the movement of the pendulum inside the case. There is a lenticle that fulfills this function on the trunk of Daniel Quare’s Year Going Boulle Longcase, made around 1695. Generally, a lenticle is a small lens. In geology, a lenticle is a lens-shaped layer of mineral or rock embedded in a different material.
