Vehicle horn horn. Bicycles often have a classic "bulb horn", operated by squeezing a rubber bulb attached to a metal horn. Squeezing the bulb forces air through a steel reed located in the throat of the horn, making it vibrate, producing a single note. The flaring horn matches the acoustic impedance of the reed to the open air, radiating the sound waves efficiently, making the sound louder. Other types of horns used on bicycles include battery-operated horns (sometimes even car horns on 12-volt circuits are incorporated) and small air horns powered by a small can of compressed gas. Oliver Lucas of Birmingham,
Alarm management alarm resolution From experience, it is known that around half of the entire alarm load usually comes from a relatively few alarms. The methods for making them work properly are documented, and can be applied with minimum effort and maximum performance improvement. Step 4: Alarm documentation and rationalisation (D&R) A full overhaul of the alarm system to ensure that each alarm complies with the alarm philosophy and the principles of good alarm management. Step 5: Alarm system audit and enforcement DCS alarm systems are notoriously easy to change and generally lack proper security. Methods are needed to ensure that the