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  2. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    A general alarm consists of a repeating 1-minute sound, made up of tones that ascend for 7 seconds and descend for 7 seconds. The end of danger is signaled by a 1-minute continuous tone. Warning sirens are tested on the first Monday of every month at noon.

  3. Fire alarm notification appliance - Wikipedia

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

    A fire alarm notification appliance is an active fire protection component of a fire alarm system. A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action. Audible appliances have been in use longer than any other method of notification.

  4. Repeater (horology) - Wikipedia

    en.wikipedia.org/wiki/Repeater_(horology)

    Repeater (horology) The 13 in (33 cm) watch by Louis Brandt (1892) was the first wristwatch with a minute repeater. The movement was manufactured by Audemars Piguet. A repeater is a complication in a mechanical watch or clock that chimes the hours and often minutes at the press of a button. There are many types of repeater, from the simple ...

  5. 2018 Hawaii false missile alert - Wikipedia

    en.wikipedia.org/wiki/2018_Hawaii_false_missile...

    Type. False alarm. On the morning of January 13, 2018, an alert was accidentally issued via the Emergency Alert System and Wireless Emergency Alert System over television, radio, and cellular networks in the U.S. state of Hawaii, instructing citizens to seek shelter due to an incoming ballistic missile. It concluded with "This is not a drill".

  6. General emergency signal - Wikipedia

    en.wikipedia.org/wiki/General_Emergency_Signal

    The signal is composed of seven or more short blasts followed by one long blast on the ship's whistle and internal alarm system. [1] Within 24 hours of embarkation of all passengers, the crew will conduct a mandatory muster drill in which the General Emergency Signal is sounded. The purpose of the drill is to educate passengers of emergency ...

  7. Public Warning System (Singapore) - Wikipedia

    en.wikipedia.org/wiki/Public_Warning_System...

    The Public Warning System (PWS) is a network of civil defense sirens installed by the Singapore Civil Defence Force on over 2,000 strategic points in Singapore to warn Singaporeans of impending dangers, air raids and atomic bomb blasts. Thus far, the siren network has only been used for occasional public awareness drills, monthly noon chimes ...

  8. Greenwich Time Signal - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Time_Signal

    The Greenwich Time Signal ( GTS ), popularly known as the pips, is a series of six short tones (or "pips") broadcast at one-second intervals by many BBC Radio stations to mark the precise start of each hour. The pips were introduced in 1924, generated by the Royal Observatory, Greenwich, and from 1990 were generated by the BBC in London. [ 1]

  9. 1 Main Circuit - Wikipedia

    en.wikipedia.org/wiki/1_Main_Circuit

    See media help. 1 Main Circuit ( 1MC) is the term for the shipboard public address circuits on United States Navy and United States Coast Guard vessels. This provides a means of transmitting general information and orders to all internal ship spaces and topside areas, and is loud enough that all embarked personnel are (normally) able to hear it.

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