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When the box is activated by turning a knob or pulling a hook, a spring-loaded wheel turns, tapping out a pulsed electrical signal corresponding to the box's number. [1] A receiver at fire headquarters announces the alarm through flashing lights or tones, or via a pen recorder, and the box number is matched to a list of box locations. In modern ...
The system can be stand alone (i.e. using dedicated loudspeakers, which can also feature integrated strobe lights), or the system can accommodate public address system functionality. In 1973, the Autocall fire alarm company (merged to SimplexGrinnell then relaunched), manufactured the first voice evacuation system. [6]
The four bulb Beacon Ray Model 175 with a clear dome and colored lenses over the bulbs were used extensively in the 1960s by the NYPD with two red bulbs alternated with a white bulb and an amber bulb canted upwards at a 45-degree angle so the amber flash would reflect off upper-floor building windows for added traffic attention/visibility.
Coded panels were the earliest type of central fire alarm control, and were made during the 1800s to the 1970s. A coded panel is similar in many ways to a modern conventional panel (described below), except each zone was connected to its own code wheel, which, depending on the way the panel was set up, would either do sets of four rounds of code until the initiating pull station was reset ...
Strobe light flash rates should not exceed 4 flashes per second; when multiple strobe lights are used, flashes should be synchronized. Warnings should be posted at venue entryways, e.g., “WARNING: Strobe lights are used during this performance”. Staff, crew, audiences and viewers should be informed prior to any usage of flickering lights or ...
Synchronized flashing or color changes with a control box are not due to twinkle bulbs, but LED ones may have two colors wired in inverse parallel within each bulb to respond to changes in electrical polarity (and voltage for brightness) from the control box. The use of blinking LEDs requires a supply of direct current (DC) such as an ...