 A basic digital clock radio with analog tuning
 A wind-up, spring-driven alarm clock An alarm clock is a clock that is designed to make an alert sound at a specific date and/or time. The primary use of these clocks is to awaken people from their sleep in order to start their days in the mornings, but they are sometimes used for other reminders as well. To stop the sound, a button or handle on the clock needs to be pressed, and some stop automatically after a few minutes if left unattended. A classical analog alarm clock has an extra "hand" that is used to specify the time at which to activate the alarm. ImageMetadata File history File links Download high resolution version (2500x1667, 657 KB) Summary Digital clock of a basic design commonly found in hotels. ...
ImageMetadata File history File links Download high resolution version (2500x1667, 657 KB) Summary Digital clock of a basic design commonly found in hotels. ...
alarm clock (taken by me) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
alarm clock (taken by me) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
A platform clock at Kings Cross railway station in London A clock is an instrument for measuring and indicating the time. ...
For other uses, see Sleep (disambiguation). ...
A wall clock A clock (from the Latin cloca, bell) is an instrument for measuring time. ...
Traditional mechanical alarm clocks have a bell on top that rings, but digital alarm clocks can make other noises. Simple battery-powered alarm clocks make a loud buzzing sound, or other similar noise to wake a sleeper, while novelty alarm clocks can speak, laugh, or sing. Some alarm clocks have radios that start playing at specified times, and are known as clock radios. A bell is a simple sound-making device. ...
Symbols representing a single Cell (top) and Battery (bottom), used in circuit diagrams. ...
In a mechanical bell-style alarm clock, a spring drives a gear that propels a clacker back and forth between two bells or between the sides inside a single bell. In an electric bell-style alarm clock, the bell rings with an electromagnetic circuit and armature that turns the circuit on and off again repeatedly. Helical or coil springs designed for tension A spring is a flexible elastic object used to store mechanical energy. ...
Electromagnetism is the physics of the electromagnetic field: a field which exerts a force on particles that possess the property of electric charge, and is in turn affected by the presence and motion of those particles. ...
An electronic circuit is an electrical circuit that also contains active electronic devices such as transistors or vacuum tubes. ...
In electrical engineering, an armature is usually the rotating part of an electric motor or dynamo. ...
History
The first mechanical alarm clock was invented by Levi Hutchins, of New Hampshire, in the United States, in 1787. This device he made only for himself however, and it only rang at 4 AM, in order to wake him for his job.[1] The French inventor Antoine Redier was the first to patent an adjustable mechanical alarm clock, in 1847.
Alarm clocks, like almost all other consumer goods in the United States of America, ceased production in the spring of 1942, as the factories which made them were converted over to war work during World War II. But they were one of the first consumer items to resume manufacture for civilian use, in November of 1944. By that time, a critical shortage of alarm clocks had developed due to older clocks wearing out or breaking down. Workers were late for, or missed completely, their scheduled shifts in jobs critical to the war effort because "my alarm clock is broken". The alarm clocks thus produced using new designs became the first "postwar" consumer goods to be made, before the war had even ended. The price of these "emergency" clocks was, however, still strictly regulated by the Office of Price Administration. Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki TÅjÅ Casualties Military dead: 17,000,000 Civilian dead: 33,000...
Bold textThe Office of Price Administration (OPA) was established within the Office for Emergency Management by the United States Government by Executive Order 8875 on August 28, 1941. ...
Modern digital alarm clocks typically feature a radio alarm function and/or beeping or buzzing alarm, allowing a sleeper to awaken to music or news radio rather than harsh noise. Most also offer a "snooze button", a large button on the top that stops the alarm and sets it to ring again at a short time later, most commonly nine minutes. Some alarm clocks also have a "sleep" button, which turns the radio on for a set amount of time (usually around one hour). This is useful for people who like to fall asleep with the radio on. A digital system is one that uses discrete values (often electrical voltages), especially those representable as binary numbers, or non-numeric symbols such as letters or icons, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (ie, as in an analog system). ...
Digital clock radios often use a battery backup to maintain the time in the event of a power outage. Without this feature, digital clocks will reset themselves incorrectly when power is restored, usually starting at midnight, causing a failure to trigger the alarm.
Computer alarms Alarm clock software programs have been developed for personal computers. A computer acting as an alarm clock may allow a virtually unlimited number of alarm times, personalized tones, online features (such as news and weather reports), and even features for insomniacs. Cron is a simple example of a program which can be used in such a manner. This article is about the sleeping disorder. ...
cron is a time-based scheduling service in Unix and Unix-like operating systems. ...
Computer alarm clocks are no longer just used for waking up. They can now be used to perform computer maintenance, send e-mails, control radio stations' playlists, pose as a school's bell on the P.A. system, speak random inspirational quotes throughout the day, or send notes to friends' cell phones via text message.
Cell phone alarms Most modern cell phones features in-built alarms that do not require the phone to be switched on for the alarm to go off. Some of these cell phones feature the ability for the user to set the tone of the alarm, music can be downloaded to the phone and then chosen to play for waking. Cellular redirects here. ...
If you are trying to upload a file onto Wikipedia, click here. ...
Next-generation alarms Among annoyances caused by alarm clocks is sleep inertia, a feeling of grogginess that results from abrupt awakening. Progressive alarm clocks claim to solve this issue. They include sunrise alarm clocks, dawn simulators and progressive auditory alarm clocks. Sleep inertia is a physiological state characterised by a decline in motor dexterity and a subjective feeling of grogginess, immediately following an abrupt awakening from deep sleep. ...
Dawn Simulation is an experimental technique used in the treatment of Seasonal Affective Disorder, also known as winter depression. ...
Scientific studies on sleep having shown that sleep stage at awakening is an important factor in amplifying sleep inertia. Alarm clocks involving sleep stage monitoring have appeared on the market in 2005. Using sensing technologies such as EEG electrodes or accelerometers, these alarm clocks are supposed to wake people only from light sleep. For other uses, see Sleep (disambiguation). ...
Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ...
“Brainwave†redirects here. ...
An accelerometer or gravimeter is a device for measuring acceleration and the effects of gravity. ...
In 2007, Sleep.FM's Social Alarm Clock evolves the nature of the alarm clock into a communication tool between humans, rather machine to human. Users on its network create and leave alarm messages (voicemails, songs, etc) for each other that are heard upon their set alarm time passing.
See also Delayed sleep-phase syndrome (DSPS) is a chronic disorder of sleep timing. ...
Basic digital alarm clock without a radio. ...
Bright light therapy is a common treatment for seasonal affective disorder. ...
A simple digital timer. ...
References Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ...
is the 306th day of the year (307th in leap years) in the Gregorian calendar. ...
External links |
Feeds |
Contact