This is a synchronous electric clock which is kept to the correct time by the 50/60 Hz AC power grid. The narrow numbered wheel and knobs on the left are the alarm mechanism. The inset shows the metal tab holding back the top flap. Mechanism of a split-flap alarm clock, removed from its case. The wheels move continuously, not in steps.

Method of operation Schematic of a split-flap display in a digital clock displayĪn electric motor (often synchronous, if directly connected to the AC line) turns two sets of wheels continuously via a reduction gear train: the faster at a rate of 1 revolution per hour, the slower at a rate of 1 revolution per 24 hours. People interested in the collection, restoration, buying and selling of flip clocks are known as horopalettologists. The study, collection and repair of flip clocks is termed horopalettology (from horology - the study and measurement of time and palette - and the Italian 'orologio a palette' - Italian for 'flip clock'). JSTOR ( January 2009) ( Learn how and when to remove this template message)Ĭopal japan 1970s Alarm flip number electric clockĪ flip clock (also known as a 'flap clock') is an electromechanical, digital time keeping device with the time indicated by numbers that are sequentially revealed by a split-flap display.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources.

Flip clock