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  2. Alarm clock - Wikipedia

    en.wikipedia.org/wiki/Alarm_clock

    A mid-1940s alarm clock radio with AM radio stations only A typical 1980s clock radio featuring a digital clock/alarm and an analogue FM/MW/LW receiver. A clock radio is an alarm clock and radio receiver integrated in one device. [18] The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm.

  3. Sony Dream Machine - Wikipedia

    en.wikipedia.org/wiki/Sony_Dream_Machine

    A clock radio that has a different alarm sound and has a volume control and two different alarms. This one comes in the MK2 version as well, It has a red LED display, and for the MK2, it has a green LED display. The first alarm is a radio alarm and the second one is the buzzer, Two bands; FM and AM.

  4. Telechron - Wikipedia

    en.wikipedia.org/wiki/Telechron

    Telechron electric alarm clock. Telechron alarm clocks are particularly popular with collectors. Until about 1940, the overwhelming majority of Telechron alarm clocks had bell alarms. The entire mechanism was enclosed in a bell housing of steel. Atop the clock's coil was a metal strip that vibrated at 60 cycles per second when the alarm was ...

  5. DCF77 - Wikipedia

    en.wikipedia.org/wiki/DCF77

    Consumer grade radio clock movement with the DCF77 receiver (right) in the clock. The small ferrite loopstick antenna used in this alarm clock can be seen at the left. Due to the propagation process, phase and/or frequency shifts observed in received signals the practical obtainable accuracy is lower than originally realized with the atomic ...

  6. Time signal - Wikipedia

    en.wikipedia.org/wiki/Time_signal

    Time stations operating in the longwave radio band have highly predictable radio propagation characteristics, which gives low uncertainty in the received time signals. Stations operating in the shortwave band can cover wider areas with relatively low-power transmitters, but the varying distance that the signal travels increases the uncertainty ...

  7. Category:Nature Sounds albums - Wikipedia

    en.wikipedia.org/wiki/Category:Nature_Sounds_albums

    Topics about Nature Sounds albums in general should be placed in relevant topic categories This category contains studio albums released on the Nature Sounds label. Please move any non-studio albums to an appropriate subcategory per WikiProject Albums guidelines .

  8. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The tower clock of Norwich Cathedral constructed c. 1273 (reference to a payment for a mechanical clock dated to this year) is the earliest such large clock known. The clock has not survived. [ 95 ] The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [ 96 ]

  9. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    The standard fire alarm sound used in most of North America [citation needed]. Coding refers to the pattern or tones a notification appliance sounds in and is controlled either by the panel or by setting jumpers or DIP switches on the notification appliances. The majority of audible notification appliances installed prior to 1996 produced a ...