A well-made large wall clock that looks good and runs smoothly can add charm and functionality to any space. For a fresh take on the traditional clock, consider this eye-catching design... Introducing Madera Wall Clock by Umbra This beautiful, modern clock has a wood veneer dial, aluminum bezel, and glass lens. Inspired by modern wristwatches Madera is intended to serve as a finishing touch for any space. Featuring a silent sweeping quartz mechanism, this wall clocks battery operated design...
Until advances in the late twentieth century, navigation depended on the ability to measure latitude and longitude. Latitude can be determined through celestial navigation; the measurement of longitude requires accurate knowledge of time. This need was a major motivation for the development of accurate mechanical clocks. John Harrison created the first highly accurate marine chronometer in the mid-18th century. The Noon gun in Cape Town still fires an accurate signal to allow ships to check their chronometers. Many buildings near major ports used to have (some still do) a large ball mounted on a tower or mast arranged to drop at a pre-determined time, for the same purpose. While satellite navigation systems such as the Global Positioning System (GPS) require unprecedentedly accurate knowledge of time, this is supplied by equipment on the satellites; vehicles no longer need timekeeping equipment.
By the time that phone hits the nightstand, you've lost precious sleep time, you've tricked your brain into thinking it's wake-up time instead of dream time, because the glow of the blue light emitted by your phone reduces your body's release of melatonin, the hormone that regulates your sleep cycle. Instead of relaxing, you've stimulated your mind. All of that adds up to poor quality sleep followed by a groggy, foggy, "I don't know why I'm so tired," kind of morning.

This is a sleek and compact AM/FM Dual Radio with Nature Sounds Tabletop Clock that features 4 selectable nature sounds (white noise, ocean, rain forest, and campfire). Select one of nature sounds to help you relax and fall asleep at the end of a long day or gently wake you up in the morning. You can also fall asleep or wake to the radio or a traditional alarm. The unit also features a large, easy-to-read 1.2” green led display with dimmer control and digital is AM /FM tuner with 10 AM and 10...

Howard Miller Carmen wrought iron wall clock with cast decorative corner ornaments finished in warm gray, dusty wax highlights. Windsor Cherry finished wood columns provide a warm accent on each side. Convex glass covers the antique dial, which offers black Roman numerals and serpentine hands. The swinging pendulum is finished in warm gray with dusty wax highlights to match the case. Quartz, non-chiming battery operated movement.

This SmartSet Alarm Radio with Bluetooth Speaker Desktop Clock is a thing of the past. The digital tuning clock radio automatically sets itself on the first use to the correct year, month, date, day, and time. The clock radio features Bluetooth v4.1 digital tuning FM radio. Includes a USB output for mobile charging (2.1a 5V) and a large and easy-to-read LED display. The alarm can be programmed to operate on weekdays only, weekends only, or all seven days of the week. Set the alarm to wake you...

Now, RCA Digital Alarm Clock is pretty basic, but for some of us, that’s all we need, right? With a bright, beaming red LED display, you’re certain to rub your eyes and wonder what weird light is pulsating from your nightstand. There’s an alarm indicator and the classic AM/PM light that we all remember from early-2000 models. You can do something different from your late 1990s-inspired clock, and that is change the brightness levels so you don’t completely burn out your retinas.


Now you can wake up to the sun without even opening your curtains. This alarm clock uses a gentle glow that simulates a sunrise, waking you gently and naturally, so you definitely won't want to murder it when it starts going off. Choose from five different calming sounds to pair with the gradual light for an all-around sensory experience, or just select the FM radio option (that you'll inevitably snooze once or twice).

The ancient Greek philosopher Plato (428–348 BC) was said to possess a large water clock with an unspecified alarm signal similar to the sound of a water organ; he used it at night, possibly for signaling the beginning of his lectures at dawn (Athenaeus 4.174c).[2] The Hellenistic engineer and inventor Ctesibius (fl. 285–222 BC) fitted his clepsydras with dial and pointer for indicating the time, and added elaborate "alarm systems, which could be made to drop pebbles on a gong, or blow trumpets (by forcing bell-jars down into water and taking the compressed air through a beating reed) at pre-set times" (Vitruv 11.11).[3]


Greek astronomer Andronicus of Cyrrhus supervised the construction of the Tower of the Winds in Athens in the 1st century B.C.[11] The Greek and Roman civilizations are credited for initially advancing water clock design to include complex gearing, which was connected to fanciful automata and also resulted in improved accuracy. These advances were passed on through Byzantium and Islamic times, eventually making their way back to Europe. Independently, the Chinese developed their own advanced water clocks(水鐘)in 725 A.D., passing their ideas on to Korea and Japan.
A brushed and polished brass finish gives this metal carriage alarm clock its enduring style. The decorative handle, turned brass button feet, and polished brass-tone columns at the corners add to the clock's stately presence. Beneath a glass crystal, the brushed brass-tone dial features circular, diamond-cut numeral ring, black Roman numerals, black hour and minute hands, and brass second and alarm hands.
Instead of sleepily fumbling with the alarm in the mornings trying to find the “off” switch, simply flip this alarm over to the other side. That’s it. Amazon reviewers rave about how minimalist and lightweight it is, perfect for throwing in your carry-on for vacations or business trips. Bonus: It comes in a variety of bright poppy hues, as well as more subdued colors like this modern dark wood.
This Mission style wall clock is finished in a Mission Oak dark finish. A parchment dial features dark brown numerals and hands. Decorative, wooden moldings frame the dial. Circular brushed brass swinging pendulum is antiqued and framed with wooden, reeded grilles. Quartz, dual chime movement plays Westminster or Ave Maria chimes, and features volume control and automatic nighttime shut-off option. Shadow collection - matching floor clock available. Size: H. 32-1/2" W.16-3/4" D.6"
Any expansion or contraction of the rod caused by changes of temperature will affect the timekeeping of a pendulum; e.g., a pendulum clock with a steel rod will lose one second a day for a rise in temperature of approximately 4 °F (2.2 °C). For accurate timekeeping, the length of the pendulum must be kept as nearly constant as possible. This may be done in several ways, some of which use the differing coefficients of expansion (the amount of expansion per degree change in temperature) of different metals to obtain a cancelling-out effect. In one popular compensation method, the bob consists of a glass or metal jar containing a suitable amount of mercury. The gridiron pendulum employs rods of different metal, usually brass and steel, while in the zinc-iron tube the pendulum rod is made of concentric tubes of zinc and iron. An improved method, however, is to make the pendulum rod from a special alloy called Invar. This material has such a small coefficient of expansion that small changes of temperature have a negligible effect and can easily be compensated for if required.

Instead of sleepily fumbling with the alarm in the mornings trying to find the “off” switch, simply flip this alarm over to the other side. That’s it. Amazon reviewers rave about how minimalist and lightweight it is, perfect for throwing in your carry-on for vacations or business trips. Bonus: It comes in a variety of bright poppy hues, as well as more subdued colors like this modern dark wood.
Inspired by a vintage bicycle wheel, this awesome Oversized Kennan Metal 26.8" Wall Clock lends a touch of industrial chic style to your walls. This factory-chic timekeeper features rusted Arabic numerals, classic black spade hands on a battery-operated rusted gear movement, and gleaming metal wheel spoke accents. Create a factory-chic focal point in your dining room by mounting this piece on the wall over a reclaimed wood sideboard for guests to admire at your next dinner party or add it to...
If you're outfitting your new home or apartment, check out more of our great buying guides like the best bar stools, the best light bulbs, the best coffee tables, the best area rugs, the best mattress toppers, the best sheets, the best mattresses, the best pillows, the best clothes hangers, the best cordless vacuum cleaners, the best laundry baskets and hampers, and the best home security cameras you can buy.
More than just a tool for keeping track of the time, this eye-catching wall clock helps turn any empty wall into an artful display. Crafted from injection plastic finished in a sleek metallic tone, it features a circular center with rods all around extending to stage the numbers of an analog dial. Measuring 16'' in diameter, it makes a statement on your kitchen or entryway wall without dominating the decor.

Showcasing the time, date, and weather, this clock is an essential for any desk. No need to lift your arm and look at your watch or light up your phone screen, this 0.3'' H x 3.7'' W x 1.5'' D design is an easy way to get the info you need. A vibrant blue backlight keeps it illuminated (requiring the power of a AA battery), while a plastic frame allows it to stand upright.
Keep track of time and exude antiqued style with this bold 24-inch oversized wall clock. Crafted from metal and wood, this round analog clock operates on quartz crystal movement and is embellished with a white background and black needles. Roman numerals lend a traditional touch, and small geometric details add extra dimension to the piece. Use this piece to help create a chic French countryside aesthetic in your kitchen. Start by painting the walls a light gray or beige tone with white trim....
Early clock dials did not indicate minutes and seconds. A clock with a dial indicating minutes was illustrated in a 1475 manuscript by Paulus Almanus,[31] and some 15th-century clocks in Germany indicated minutes and seconds.[32] An early record of a seconds hand on a clock dates back to about 1560 on a clock now in the Fremersdorf collection.[33]:417–418[34]
A brushed and polished brass finish gives this metal carriage alarm clock its enduring style. The decorative handle, turned brass button feet, and polished brass-tone columns at the corners add to the clock's stately presence. Beneath a glass crystal, the brushed brass-tone dial features circular, diamond-cut numeral ring, black Roman numerals, black hour and minute hands, and brass second and alarm hands.

The clock is beautiful and just as depicted.: The clock is beautiful and just as depicted. The seller was very conscientious in updating us on shipping status as this item was on back order when we first ordered it. We were given the option to cancel the order due to shipping delays but we are very glad we didn't. The clock is a signature piece in our newly remodeled kitchen.
The oldest surviving clock in England is that at Salisbury Cathedral, which dates from 1386. A clock erected at Rouen, France, in 1389 is still extant, and one built for Wells Cathedral in England is preserved in the Science Museum in London. The Salisbury clock strikes the hours, and those of Rouen and Wells also have mechanisms for chiming at the quarter hour. These clocks are large, iron-framed structures driven by falling weights attached to a cord wrapped around a drum and regulated by a mechanism known as a verge (or crown wheel) escapement. Their errors probably were as large as a half hour per day. The first domestic clocks were smaller wall-mounted versions of these large public clocks. They appeared late in the 14th century, and few examples have survived; most of them, extremely austere in design, had no cases or means of protection from dust.
At home in the most up-to-date atmospheres, this wall clock combines a Merlot Cherry finish with brushed nickel accents. The brushed nickel-finished pendulum and bezel add to the contemporary styling. The crisp white dial features black bar hour markers and black hour and minute hands. Finished in Merlot Cherry, a very dark maroon finish that is leaning toward black on an injected molded body. Quartz, battery operated movement.
A. Like many items today, the amount you’ll pay for an alarm clock depends on how much technology you want layered onto it. If you desire nothing but a simple analog alarm clock that rouses you with a single tone, you could spend as little as $10. A slightly more sophisticated clock radio might cost $20 or so. If you want a deluxe digital alarm clock with screen projection, Bluetooth capability, MP3 player, or other cool features, you’re looking at a price of anywhere from $40 to $90.
The Howard Miller Spokane 15.75" Wall Clock is a piece of classic design and features. This simple yet functional timepiece has a brushed aluminum finish. This round shape clock is very convenient and can be mounted on any wall of your home. This wall clock can be used for residential as well as commercial use as it has simple and subtle. This round wall clock from Spokane has a silver finished case with white background for ease at readability. This wall clock is numbered and features Arabic...

At home in the most up-to-date atmospheres, this wall clock combines a Merlot Cherry finish with brushed nickel accents. The brushed nickel-finished pendulum and bezel add to the contemporary styling. The crisp white dial features black bar hour markers and black hour and minute hands. Finished in Merlot Cherry, a very dark maroon finish that is leaning toward black on an injected molded body. Quartz, battery operated movement.
Use of a Clock is optional. All key date-time classes also have a now() factory method that uses the system clock in the default time zone. The primary purpose of this abstraction is to allow alternate clocks to be plugged in as and when required. Applications use an object to obtain the current time rather than a static method. This can simplify testing.
Bring contemporary and clean-lined looks to your walls with this understated wall clock, this perfect mix of subtle, airy looks and midcentury modern aesthetics in your space. Featuring a simple rectangular metal frame finished in antique brass and distressed gray, this clock brings a warm look to your ensemble, while its elongated Roman numerals offer an updated twist on a classic look. To clean, simply wipe with a damp cloth.

In addition to radio, recent clock radios have other music sources such as iPod, iPhone, and/or audio CD. When the alarm is triggered, it can play a set radio station or the music from a selected music source to awaken the sleeper. These models usually come with a dock for iPod/iPhone that also charges the device while it is docked. They can play FM/AM radio, iPod/iPhone or CD like a typical music player as well (without being triggered by the alarm function). A few popular models offer "nature sounds" like rain, forest, fire, sea, waterfall etc., in place of the buzzer.


As of the 2010s, atomic clocks are the most accurate clocks in existence. They are considerably more accurate than quartz clocks as they can be accurate to within a few seconds over thousands of years.[54] Atomic clocks were first theorized by Lord Kelvin in 1879.[55] In the 1930s the development of Magnetic resonance created practical method for doing this.[56] A prototype ammonia maser device was built in 1949 at the U.S. National Bureau of Standards (NBS, now NIST). Although it was less accurate than existing quartz clocks, it served to demonstrate the concept.[57][58][59] The first accurate atomic clock, a caesium standard based on a certain transition of the caesium-133 atom, was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.[60] Calibration of the caesium standard atomic clock was carried out by the use of the astronomical time scale ephemeris time (ET).[61] As of 2013, the most stable atomic clocks are ytterbium clocks, which are stable to within less than two parts in 1 quintillion (2×10−18).[62]
This Oversized Rustic Wood 24" Wall Clock is one of the best sellers and for good reason - this wonderfully shabby elegance wall clocks really give that country home decor or rustic decor character that you cannot find anywhere else! The simple beauty of it is amazing it a part for that shabby elegance decor or rustic home decor charm! Gorgeous in kitchens or anywhere you want to complete that French country decor look as well!
With it's quality construction and stylish mid-century modern design, the 31.5" Rumi Mid Century Wall Clock is an attractive accent for the home. Crafted entirely of iron, this large wall clock features a dark brown distressed finish and large distressed gold hands. Minimalism is reflected in the clock's open pass-through design. This clock is a must-have for anyone in search of mid-century modern inspired decor.
You can choose from an analog styled clock to a digital one. Our alarm clocks can vary from old, retro, 1950 styled clocks to modern 2013. Depending on your desire, we have wind up alarm clocks, clocks that do or do not tick, or clocks with or without a built in radio. We have clocks for children, clocks that run on battery, or ones that plug directly into an outlet.
After a long day at work, school, or running errands, it's tough to beat the feeling of climbing into your bed for a good night's rest. When you're feeling tired, it's tough to get back out of bed in the morning to start all over again. With the right alarm clock, you can wake up to pleasant sounds that make it a little easier to get up and going. With a wide selection of alarm clock options available at JCPenney, you can find the style that fits with the look and feel of your bedroom while delivering the functionality you need.
The advantage of a harmonic oscillator over other forms of oscillator is that it employs resonance to vibrate at a precise natural resonant frequency or 'beat' dependent only on its physical characteristics, and resists vibrating at other rates. The possible precision achievable by a harmonic oscillator is measured by a parameter called its Q,[68][69] or quality factor, which increases (other things being equal) with its resonant frequency.[70] This is why there has been a long term trend toward higher frequency oscillators in clocks. Balance wheels and pendulums always include a means of adjusting the rate of the timepiece. Quartz timepieces sometimes include a rate screw that adjusts a capacitor for that purpose. Atomic clocks are primary standards, and their rate cannot be adjusted.
This alarm clock uses scent cartridges to wake you up to the smell of your favorite things, from bacon (!!!) to sweet peach. You can purchase any variety of cartridges you'd like (scents include bacon, cappuccino, mint, strawberry candy, banana, and sweet peach), but your initial purchase will come with one bacon capsule. Each cartridge contains 30 wake-ups.
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.
Sounds like a Marvel villain if you say it out loud, doesn’t it? Sonic Alert Vibrating Skull Crusher Clock has a bit of edge to it, and like your metal days, it’s going to wake you up with a thunderous roar. You get 113 decibels of noise, which is basically like a crappy $20.00 blender whizzing right next to your head. Hook up your phone or MP3 player to rock out to your tunes in the morning, should you dare. You get a five-dimmer setting for the red LED display, and the 12-volt bone crusher bed shaker, just to make sure you’re really awake in the morning.
A perfect piece for nightstands and home office desks, this radio alarm clock tunes to your favorite stations as it keeps an eye on the hour. Its bright red LED numbers are easy to read from afar, while the repeating nine-minute snooze is sure to become your new best friend on lazy Sunday mornings. This digital clock includes memory for up to 20 radio stations and includes an audio input for smartphones and MP3 players. Though this radio plugs into your wall, it also runs on two AAA batteries...
If you’re looking for a calmer start to your day, you might want to try the Wake-Up Light. It gradually gets you up and out of bed with a colored sunrise simulation and a selection of nature-inspired sounds, so that you can start the day feeling refreshed and energized—as if you had woken up naturally. For anyone who finds it particularly hard to get out of bed when it’s cold and dark out, this alarm clock makes those winter mornings that little bit easier. It also comes with a nighttime dimming feature so that you can make sure you’re getting your best night’s rest.
Hopefully, you don’t have sensitive eyes. Get ready to have over 100 lumens pull up on you like the flashlight of a police officer on a Saturday night. One thing’s for sure—it’s going to wake you up, and keep you up. This is a nature sounds alarm clock to boot, so you’ll feel like you’re in the middle of the meadow when it goes off. A very bright meadow. NakaLight Wake Up will gradually light up a half hour before you awaken to ease you out of sleep.
Strong, durable, super large time display makes the model perfect for those who either want a big number clock, or for visually impaired individuals who need extra-large numerals, The red LED display on a black background, makes the contrast ideal for easy viewing. The electric power with battery backup lets you sleep with peace of mind and the extra-large snooze bar keeps nap-time within reach. This clock is a solid purchase.
A captivating timepiece, this 29-inch wall clock stylishly pays homage to French country style with elegance. Especially fitting for an empty wall space, this wooden piece effortlessly draws the eye with its bold Roman numerals and matching clock hands that hover over a pale aqua and ivory-colored face. Its fleur-de-lis and floral details are a harmonious match for a romantic and feminine aesthetic in the living room, which is easily complemented by other weathered décor and Parisian...
An on-trend take on a retro design, this 12" round wall clock brings a splash of color to any space in your home. This budget-friendly accent showcases a circular face bordered by alternating blocks of green, blue, and red hues with black Roman numerals in the center. Its plastic frame ensures that it’s lightweight and easy to hang, while its metallic pierced hands offer subtle shimmer. This piece does not include batteries.
This farmhouse wall clock measures 30 in. across This farmhouse wall clock measures 30 in. across the face and features horizontal cedar wood slats a white distressed finish hand painted black Roman numerals in a Poster Condensed font and an inner accent ring with individual hour marks. It includes a high torque quartz movement antique-style spade hands and ...  More + Product Details Close
The Homedics SoundSpa Digital FM Tabletop Clock with time projection gives you the power to create a soothing, relaxing sleep environment. Choose from eight peaceful relaxation sounds including ocean, white noise, brook, rainforest, thunder, rain, fan, campfire, or simply switch on the radio. The SoundSpa Digital FM Tabletop Clock comes with the option of time projection and a soothing blue light.
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