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.


This Alarm Clock has many features that make it an excellent addition to your nightstand, work station, kitchen counter or end table. The first thing that separates this Alarm Clock from the rest are the two, easily accessible USB ports located directly on the front of the clock. These ports are fast charging and are perfect for your phone or tablet. Second, the illuminated digits are bright and easy to read in the dark. If you find them too bright when you are trying to fall asleep there is a...
Improve independence with this Reminder Rosie personal voice reminder clock. It lets you schedule reminders for your loved one, letting them know what to do and when to do it, which helps seniors maintain independence for as long as possible. This Reminder Rosie alarm clock with personal voice reminder has a senior-friendly clock interface with an enlarged digital display.
Slave clocks, used in large institutions and schools from the 1860s to the 1970s, kept time with a pendulum, but were wired to a master clock in the building, and periodically received a signal to synchronize them with the master, often on the hour.[71] Later versions without pendulums were triggered by a pulse from the master clock and certain sequences used to force rapid synchronization following a power failure.
Minimalist design and modern style combine in this 11" wall clock. Set under a clear glass lens on chrome posts, the streamlined dial showcases chrome military indicators on the 12, 3, 6, and 9 over a warm brown woodgrain background, while the unadorned face of the clock takes the form of a brushed metal disk. Operated by a AA battery (not included), a quartz crystal movement keeps the simple baton hour, minute, and second hands ticking away in time.

The late Roman statesman Cassiodorus (c. 485–585) advocated in his rulebook for monastic life the water clock as a useful alarm for the 'soldiers of Christ' (Cassiod. Inst. 30.4 f.).[4] The Christian rhetorician Procopius described in detail prior to 529 a complex public striking clock in his home town Gaza which featured an hourly gong and figures moving mechanically day and night.[4]


Now this is an alarm clock for the heaviest sleeper. If you're the type who sleeps through anything — thunderstorms, loud neighbors, earthquakes, the zombie apocalypse — you've finally met your match. Sonic Alert's Sonic Bomb Alarm Clock doesn't just rely on its 113-decibel alarm to pry your eyelids open (for comparison, that's about the same decibel level as a car horn or snow blower going off in your ear), it also has a shaker device that slips underneath your mattress or pillow to jiggle you awake, and red flashing lights that trigger with the alarm.
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.
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Make every second count with modern wall clocks from CB2. Numberless styles look chic and minimalist anywhere from above the mantel or bed to the kitchen wall. Freestanding table clocks in unique materials such as stone and marble fit in perfectly with other modern decor—accent with glass bud vases, metallic coasters and more. Don't forget to add a modern wall clock to the office and an alarm clock to your bedside!

Bolter, David J. Turing's Man: Western Culture in the Computer Age. The University of North Carolina Press, Chapel Hill, N.C. (1984). ISBN 0-8078-4108-0 pbk. Very good, readable summary of the role of "the clock" in its setting the direction of philosophic movement for the "Western World". Cf. picture on p. 25 showing the verge and foliot. Bolton derived the picture from Macey, p. 20.

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You know that feeling you get when you draw the blinds, and you didn’t expect it to be so sunny? That’s what this alarm clock does for you, except it wakes you up instead. Philips incorporated yellow-and-white light into this sunrise simulation programmable alarm clock, and this is the only alarm clock/lamp that’s certified to help you sleep better, and awake more refreshed than you ever thought possible. From America’s favorite retailer of small and budget-friendly gadgets, Philips does it again.
This Alarm Clock has many features that make it an excellent addition to your nightstand, work station, kitchen counter or end table. The first thing that separates this Alarm Clock from the rest are the two, easily accessible USB ports located directly on the front of the clock. These ports are fast charging and are perfect for your phone or tablet. Second, the illuminated digits are bright and easy to read in the dark. If you find them too bright when you are trying to fall asleep there is a...
This Roman Numerals Vintage Wall Clock makes telling time easier on the eyes. The clock’s backing is made to look like aged barnwood. It has black metal framing and large Roman Numerals on its dial cut from the same black painted metal. Silver studs dot the frame wherever the numerals join it for a striking, yet simple, accent. The hands of the clock are metal too, telling the time with a minute and hour hand. This stunning Roman Numerals Vintage Wall Clock really strikes a chord for home...

Keep time in style with this traditional tabletop clock, a great way to round out a decorative vignette while adding essential function. Crafted from wood and metal, this circular design sits atop a curved base and pairs an antique dial with a deep red finish. The glass-inlaid clock face sports glow-in-the-dark hands, so you can check the time in the wee hours and early evening, while a quartz movement keeps this design tickin’ and tockin’. Requires a battery.


Stay on schedule and charge a range of devices with this innovative iHome dual-alarm clock. Place your compatible smartphone on top of the Qi-certified device for swift wireless charging, or plug your phone into the clock’s handy powered USB port. This iHome dual-alarm clock incorporates NFC technology, so you can connect an array of Bluetooth-enabled devices with a quick touch.
Transform an open and plain wall into a timeless focal point with this oversized clock, a versatile addition that lends any room in your home a touch of charm. Crafted of metal, this gray-finished piece features inner and outer rings connected by large Roman numerals that bring classic appeal to your space. This open-faced design is perfect for making a statement without overwhelming your arrangement. Mount this analog over a well-worn leather sofa so you don't lose track of the time as you...
In 1675, Huygens and Robert Hooke invented the spiral balance spring, or the hairspring, designed to control the oscillating speed of the balance wheel. This crucial advance finally made accurate pocket watches possible. The great English clockmaker, Thomas Tompion, was one of the first to use this mechanism successfully in his pocket watches, and he adopted the minute hand which, after a variety of designs were trialled, eventually stabilised into the modern-day configuration.[40] The rack and snail striking mechanism for striking clocks, was introduced during the 17th century and had distinct advantages over the 'countwheel' (or 'locking plate') mechanism. During the 20th century there was a common misconception that Edward Barlow invented rack and snail striking. In fact, his invention was connected with a repeating mechanism employing the rack and snail.[41] The repeating clock, that chimes the number of hours (or even minutes) was invented by either Quare or Barlow in 1676. George Graham invented the deadbeat escapement for clocks in 1720.
Reminisce fond memories of your school years with this 8.3" Retro Modern Wall Clock. Fashioned with contemporary and retro accents, the wall clock will transport you to your childhood days with its vintage design. Indulge in nostalgia with this simple and elegant wall clock. Crafted out of ABS thermoplastic and glass components, the wall clock is will elevate the vintage style of your home. The top and base materials are made out of sturdy ABS thermoplastic which gently wraps itself around the...
The Philips Wake-Up Light offers a choice of five pleasant nature sounds — or for the more traditionally minded, FM radio — for your morning wake-up call, but the real star of the show is the sunlight simulation. Twenty to forty minutes before your programmed wake-up time (you set both times), the clock will slowly begin to simulate the sunrise, complete with the softest dawn reds and oranges gently brightening into sunny, yellow light.
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"
Emerson alarm clock radio features relaxing sounds that help you unwind and fall asleep faster. Perfect for bedrooms, baby nurseries, spas, salons, apartments, offices and anywhere where unwanted disturbing or intrusive noise is a problem. The noise sound machine can help block out distractions and promote relaxation prior to sleep to provide you with a more peaceful, restful night sleep. Sounds include ocean side, rain, rain forest, summer night, tide and noise. With features such as a...
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.
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