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A horn antenna serves the same function for electromagnetic waves that an acoustical horn does for sound waves in a musical instrument such as a trumpet. It provides a gradual transition structure to match the impedance of a tube to the impedance of free space, enabling the waves from the tube to radiate efficiently into space.
A magnetic horn or neutrino horn (also known as the Van der Meer horn) is a high-current, pulsed focusing device, invented by the Dutch physicist Simon van der Meer in CERN, that selects pions and focuses them into a sharp beam. The original application of the magnetic horn was in the context of neutrino physics, where beams of pions have to be ...
Conch shell (if played like a trumpet) 423.111.2 With mouthpiece. 423.112 Side-blown. 423.12 Tubular trumpets. 423.121 End-blown trumpets - The mouth-hole faces the axis of the trumpet. 423.121.1 End-blown straight trumpets - The tube is neither curved nor folded. 423.121.11 Without mouthpiece. Didgeridoo; 423.121.12 With mouthpiece. Trembita
The system was updated in 2011 as part of the work of the Musical Instrument Museums Online (MIMO) Project. [2] Hornbostel and Sachs based their ideas on a system devised in the late 19th century by Victor-Charles Mahillon, the curator of musical instruments at Brussels Conservatory. Mahillon divided instruments into four broad categories ...
In most horns it also determines the pitch of the sound. When vibrated by the diaphragm, the column of air in the horn vibrates in standing waves. The length of the horn determines the wavelength of the sound waves generated, and thus the fundamental frequency (pitch) of the note produced by the horn. The longer the horn, the lower the pitch.
The cornu (Latin "horn") was a long tubular metal wind instrument that curved around the musician's body, shaped rather like an uppercase G. It had a conical bore (again like a French horn) and a conical mouthpiece. It may be hard to distinguish from the buccina. The cornu was used for military signals and on parade.