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2. Engine 51 - Wikipedia

   en.wikipedia.org/wiki/Engine_51

   Engine 51 is known for its time in the 1970s TV show Emergency!. Engine 51 is actually two very different fire engines. Both Engines 51 sit in the Los Angeles County Fire Museum right next to the famous Squad 51. The museum is building a new facility that will house the Squad 51 in Carson, California, where the show was filmed. [citation needed]

3. Air horn - Wikipedia

   en.wikipedia.org/wiki/Air_horn

   In trucks and buses, the air horn is powered with compressed air from the vehicle's air brake system. In trucks, a cord mounted on the ceiling of the operator's cab is pulled or in buses, a valve lever on the side of the dashboard is pushed down or pulled up to open the valve, supplying varying amounts of air to the horn.

4. Emergency vehicle equipment - Wikipedia

   en.wikipedia.org/wiki/Emergency_vehicle_equipment

   Emergency vehicles are equipped with the following types of equipment to do so: [1] two-way radio, usually operating on dedicated frequencies and channels designated for emergency use, or in some cases simply a CB radio. portable two-way radios, which transmit and receive on the same frequencies as the built in two-way radios, but are less ...

5. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   In Germany and some other European countries, the pneumatic two-tone (hi-lo) siren consists of two sets of air horns, one high pitched and the other low pitched. An air compressor blows the air into one set of horns, and then it automatically switches to the other set. As this back and forth switching occurs, the sound changes tones.

6. Nathan Manufacturing - Wikipedia

   en.wikipedia.org/wiki/Nathan_Manufacturing

   The P-series horns have longer bells and a heavier manifold than the M-series. [9] The name of the horn is a P followed by the bells that face forward, followed by R if any are reversed, and then the numbers of the reversed bells; a P12345 is a true five-chime horn with all bells facing forward, while P135R24 has bells 2 and 4 reversed. [2]

7. Fire alarm notification appliance - Wikipedia

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

   Voice evacuation systems can also be used by personnel to give specific live information and/or instructions over the alarm system using a built-in microphone, which provides a distinct advantage over horns or bells. The system can be stand alone (i.e. using dedicated loudspeakers, which can also feature integrated strobe lights), or the system ...