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Analog flip clock1/16/2024 There are two of each hour, like this: 12 am, 12 am, 1 am, 1 am, 2 am, 2 am. These leaves have hour numbers printed on them. The slower wheel has connected to it a similar ring of leaves, only there are 48 leaves on this ring. This ring is put into position and rotated so that one page falls each minute, showing a new number for the minutes. The "book" is opened vertically, and its pages form a ring. On the leaves are printed numerals so that, when a person holds two adjacent leaves apart like an open book, the two open leaves spell out a numeral, and flipping a leaf down increases the number shown by 1 unit. The faster wheel has connected to it a ring of 60 flat plastic leaves. The small hook which retains the hour leaves until the top of the hour can be dimly seen, retracted, in the inset. 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. 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)Ī 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.
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