In a clock driven by a weight or a spring, the power is first transmitted by the main, or great, wheel. This engages with a pinion (a gear with a small number of teeth designed to mesh with a larger wheel), whose arbor (a turning rod to which gears are attached) is attached to the second wheel that, in its turn, engages with the next pinion, and so on, down through the train to the escapement. The gear ratios are such that one arbor, usually the second or third, rotates once an hour and can be used to carry the minute hand. A simple 12-to-1 gearing, known as the motion work, gives the necessary step-down ratio to drive the hour hand. The spring or weight is fitted with a mechanism so it can be rewound when necessary, and the arbor carrying the minute hand is provided with a simple slipping clutch that allows the hands to be set to the correct time.
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The most accurate mechanical timekeeper is the Shortt pendulum clock; it makes use of the movement described above for electric master clock systems. The Shortt pendulum clock consists of two separate clocks, one of which synchronizes the other. The timekeeping element is a pendulum that swings freely, except that once every half minute it receives an impulse from a gently falling lever. This lever is released by an electrical signal transmitted from its slave clock. After the impulse has been sent, a synchronizing signal is transmitted back to the slave clock that ensures that the impulse to the free pendulum will be released exactly a half minute later than the previous impulse. The pendulum swings in a sealed box in which the air is kept at a constant, low pressure. Shortt clocks in observatories are kept in a room, usually a basement, where the temperature remains nearly constant, and under these conditions they can maintain the correct time to within a few thousandths of a second per day.
Clocks aren't just for telling time! Take this one for example: artful with its understated analog dial, this piece is perfect lending an upscale feel to your living room look or kitchen ensemble. Measuring 16'' circular, its frame features a glass design accented by a shiny chrome center and openwork hands to mark the hour. This product required one AA battery to operate, which is not included. Suitable for indoor use only.
Time flies when you’re having fun, and you’re going to have a great time updated your look with this chic clock. As much an accent as it is a functional tool, this elegant design will instantly elevate any tabletop display. This clock blends modern minimalism with a pop of glam thanks to its solid-toned background, simple white hour marks, and glossy metallic frame. Try setting it on your master suite nightstand, so you can keep your eye on the time during your morning routine. Next, lean...
"Very easy to use...Excellent Product...I cannot say enough about this clock -I love the fact mum is hearing my voice on a daily basis even though I live in another country....it's truly a great concept - great design and well worth it for elderly - for dementia patients or even for individuals who need a talking reminder about daily tasks or appts."
"Not bad...Love it...This alarm clock is perfect for anyone looking to charger your phone wireless and also has a USB to charger anything you want I have it to charger my gear S3 I also like that it's Bluetooth so I can play music and pick up phone call so I will Recommend this alarm clock to anyone looking to do the same thing I do with it I didn't talk about the alarm it's self because it like any other alarm set it up to Wake you up and it does its job...This is a nice alarm clock and also a decent Bluetooth radio however the reason I picked this up was for the wireless charger for the iPhone X. Regardless of the position the charger flashes on and off in a matter of seconds."
c. 1350–1400, Middle English clokke, clok, cloke, from Middle Dutch clocke (“bell, clock”), from Old Northern French cloque (“bell”), from Medieval Latin clocca, probably of Celtic origin, from Proto-Celtic *klokkos (“bell”) (compare Welsh cloch, Irish clog), from Proto-Indo-European *klēg-, *klōg-. Related to Old English clucge, Saterland Frisian Klokke (“bell; clock”), Low German Klock (“bell, clock”), German Glocke, Swedish klocka. Related to laugh.
“This little beauty works great. I bought it when the alarm on my mobile phone began to intermittently fail me. This little travel clock is beautiful in retro seafoam green and great for travel because its bright color ensures that you will never miss picking it up from your hotel nightstand at checkout. There is a faint, pleasant ticking, the hands glow in the dark, and the nightlight button is bright when needed. The pop-up alarm button is firm and works well though I am learning not to accidentally press it and turn the alarm off when picking up the clock. Overall, a fantastic alarm clock.”