Flip clock
![Schematic of a split-flap display in a digital clock display](/Images/godic/202502/16/Analog_clock_with_digital_display2316.png")
![Mechanism of a split-flap alarm clock, removed from its case. The inset shows the metal tab holding back the top flap. The narrow numbered wheel and knobs on the left are the alarm mechanism. Unlike quartz clocks, this is a synchronous electric clock which is kept to the correct time by the 50/60 Hz AC power grid.The small hook which retains the hour leaves until the top of the hour can be dimly seen, retracted, in the inset.](/Images/godic/202502/16/Split-flap_display2316.jpg")
![A 1969 radio alarm clock (Sony Digimatic 8FC-59W) with an early digital display](/Images/godic/202502/16/Clock_radio2316.png")
A Flip Clock is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split flap display. The study, collection and repair of flip clocks is termed horopalettology [From horology - The study and measurement of time and palette - from the Italian "Orologi a palette" - Italian for flip clock]. People interested in the collection, restoration, buying and selling of flip clocks are called horopalettologists.