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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. Thus, an outstretched hand reaching upward and pumping is a signal to the driver of an air horn equipped vehicle, requesting ...
The Hornbostel–Sachs system of musical instrument classification groups all instruments in which sound is produced through vibrating air. This can include a column of air being set in vibration (as in wind instruments) or an air-flow being interrupted by an edge (as in free-reeds).
A megaphone, speaking trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves ...
Uses explosions to produce sound in pipes. Weak similarity to pipe organ or calliope (which run air/steam through pipes, but producing sound through the friction of air on ducts). pitched percussion: Steam calliope pipe organ: Sea organ: hydraulophone: The sea organ is both an experimental musical instrument and a tide organ: unpitched ...
The Alpine distress signal is a distress signal in the case of mountain emergency, an emergency in alpine areas. It involves repeating a sound or other signal six times within a minute, then pausing for a minute before repeating. [1]
Northey added a secondary compressed air supply to the piston in order to power it during both its forward and reverse strokes and thus create an even more powerful sound. [5] The entire horn apparatus was driven by a compressor. To manufacture the new equipment, Northey set up the Diaphone Signal Co. at Toronto in 1903. [6]
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