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Encyclopedia Britannica - Main :: TUM-VAN |
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VALVE (Lat. valva, a leaf of a double or folding door, allied to volvere, to roll, as of a door on its hinges) , a term applied to many mechanical appliances, devices or natural features,which control , by opening and shutting, the flow of air, liquids, vapour, gas, &c., through a passage, tube, pipe or other vessel. VALVES, or PISTONS (Fr. pistons, cylindres; Ger. Ventile; Ital. piston), in music, mechanical contrivances applied to wind instruments
Greece
change the mode or key in which he was playing, just as did the crooks many centuries later. But the resourcefulness of the ancients did not stop there. The tibiae found at Pompeii (see Aunos) had sliding bands of silver, one covering each lateral hole in the pipe; in the band were holes (sometimes one large and one small, probably for semitone and tone) corresponding with those on the pipe. By turning the band the holes could be closed, as by keys when not required. By fixing the 6 of in the holes of the bands, the bore was lengthened instantly at will, and just as easily shortened again by withdrawing them; this method was more effective than the use of the crooks, and foreshadowed the valves of eighteen centuries later. The crooks, or coils of tubing inserted between the mouthpiece and the main tube in the trumpet and horn, and between the slide and the bell joint in the trombone, formed a step in this direction.Although the same principle underlies all these methods, i.e. the lengthening of the main column of air by the addition of other lengths of tubing, the valve itself constitutes a radical difference, for, the adjustment of crooks demanding time and the use of both hands, they could only be effective for the purposes of changing the key and of rendering a multiplicity of instruments
instrument to which it was applied was at once placed on a different basis; it became a chromatic instrument capable of the most delicate modulations from key to key. The slide had already accomplished this desirable result, but as its application was limited to instruments of which the greater part of the bore was cylindrical, i.e. the trumpet and trombone, its influence on concerted musical composition could not be far-reaching. In fact it is doubtful whether the chromatic possibilities of the slide were fully realized until the end of the 18th century, when key mechanism having made some advance, it was being applied successfully to the transverse flute
Petersburg
Such were the conditions prevailing among the wind instruments of the orchestra when the successful application of the valve to brass wind instruments by Heinrich Stolzel of Silesia caused an instantaneous revolution among makers of wind instruments. Further efforts to perfect the key system as applied to the brass wind were abandoned in favour of valves. The short space of two decades witnessed the rise of the Fliigelhorns, the tubas, the saxhorns and the cornet-a-pistons; the trombone, French horn and trumpet having led the van, Sound is produced on brass wind instruments by overblowing the members of the harmonic series (see Hoax). ' The harmonic series itself is invariable, whether obtained from a string
of air; the structural features of the instrument determine which members of the series it is able to produce. End of Article: VALVE (Lat. valva, a leaf of a double or folding door, allied to volvere, to roll, as of a door on its hinges) If you wish, you can link directly to this article.
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