An American invention of 1903 utilizing the spring-like properties of then celluloid sheet. Two small circular drums bear a large number of small celluloid tickets free to pivot at the point of attachment on the periphery of the drums, and marked with numbers to indicate hours and minutes. Each ticket in turn is flexed against a pointer until released at the precise moment, upon which the ticket flicks over to display the opposite side, passing over a fixed index which then holds it in place to show the time. The drums holding the tickets are rotated by extended arbors from normal motion work powered by a small, spring-driven balance-wheel clock in the circular base; a glass tube surmounts this and is sealed by a metal circular top with a carrying handle. The visible metal parts are usually nickel plated, occasionally silver plated, and rarely gold plated. The clock was very popular in the United States and was later made in huge quantities in France and Germany. Alternative names for the ticket clock are Plato, digital, flick, flick-leaf and figure clock. In a different form the ticket display is used for the digital display of time in some modern electric clocks, for instance, the Caslon electrical digital clock made by the Copal Co.