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A wristband travel alarm clock was patented in 1908 by the Eterna company. The best-known wristband-type travel alarm clock models were Jaeger-LeCoultre's Memovox in 1950 and Pierce's Duofon in 1955. [8] While the dwellings adapted to the contemporary taste of the society, the technology remained the same for a long time. Only with electronics ...
Frequently, false alarms occur because car alarm owners use high sensitivity settings. This may be the main reason why loud bass frequency sound (loud music, other cars or motorcycles with loud exhaust systems, thunderstorms, etc.) can set off car alarms. The second possible reason is that some parts of the alarm system may be improperly installed.
an alarm clock that sounds an alarm at a pre-set time, often used to wake a person up or remind them of an event. a fire alarm which is used to give occupants of a building early warning of a potential fire and give them time to evacuate. warning devices on a vehicle that sound when it is moving in an unexpected direction, such as reversing,
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...
The signal was turned off if the block were not "clear"; no current passed through the coherer and a relay turned a white or green light in the cab to red and applied the brakes. [5] The London & South Western Railway installed the system on its Hampton Court branch line in 1911, but shortly after removed it when the line was electrified .
Alarm clocks with visible indicators are sometimes used to indicate to children too young to read the time that the time for sleep has finished; they are sometimes called training clocks. A clock mechanism may be used to control a device according to time, e.g. a central heating system, a VCR, or a time bomb (see: digital counter).
A siren with only one row of ports is called a single tone siren. A siren with two rows of ports is known as a dual tone siren. By placing a second stator over the main stator and attaching a solenoid to it, one can repeatedly close and open all of the stator ports thus creating a tone called a pulse. If this is done while the siren is wailing ...
A vehicle lawfully displaying courtesy lights is not an emergency response vehicle. In most states, vehicles displaying courtesy lights must still stop at stop signs, red lights, etc. and may not speed or disobey any traffic regulations. [1] Usually, violation ticket fines are increased if the ticketed car was flashing courtesy lights.