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Audible signals, most often from ringers or buzzers, could be handled several ways. The ringer in a specific telephone set could be hardwired to one specific phone line. This had the advantage that the phone would ring any time a call came in on that specific line, even during a local power failure, but it also had the disadvantage of limiting ...
Gerald Summers (1899–1967) was a British mid-century modern furniture designer. He came to prominence with his design for the Bent Plywood Armchair. Another of his noted works was the Two-Tier Table. Both pieces were designed in 1934 and manufactured by Makers of Simple Furniture, the firm he founded. [1] [2] [3]
The majority of audible notification appliances installed prior to 1996 produced a steady sound for evacuation. In general, no common standard at that time mandated any particular tone, or pattern for audible fire alarm evacuation signals. While less common than a steady sound, differing signaling methods were used for the same purpose.
This helps eliminate false alarms and unnecessary responses. Dual signaling has helped considerably with the restoration of police response as in an instance where a phone line is cut as the dual signaling device can continue to send alarm calls via one of its alternative paths either confirming or denying the alarm from the initial path.
An AWS audible indicator (capable of producing two different sounds, clear indication sound = bell, warning indication sound = 'horn'. On modern rolling stock the electromechanical bell and horn is replaced with an electronically generated "chime" or "buzz". An AWS Acknowledge button (used to
The word alarm comes from the Old French a l'arme meaning "to the arms", or "to the weapons", telling armed men to pick up their weapons and get ready for action because an enemy may have suddenly appeared. [1] The word alarum is an archaic form of alarm. It was sometimes used as a call to arms in the stage directions of Elizabethan dramas. [2]
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Selective calling is akin to the use of a lock on a door. A radio with carrier squelch is unlocked and will let any signal in. Selective calling locks out all signals except ones with the correct "key", in this case a specific digital code. Selective calling systems can overlap; e.g. a radio may have CTCSS and DTMF calling.