The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . d such as the horns, bugle,trumpet and tubas, which, in their simplest form, consist oftubes without lateral openings, de-pend for their scale on the harmonicseries obtained by overblowing, greater pressure of breath andby the increased tension of the lips,acting as reeds, across the mouth-piece. The harmonic series thusproduced, which depends on the„ P^^-^^o^^^ Service acoustic principles of the tube MahUlon) ^ ^^^ ^^ ^ absolutely uninfluenced by the manner in which the tubeis bent, for
The encyclopdia britannica; a dictionary of arts, sciences, literature and general information . d such as the horns, bugle,trumpet and tubas, which, in their simplest form, consist oftubes without lateral openings, de-pend for their scale on the harmonicseries obtained by overblowing, greater pressure of breath andby the increased tension of the lips,acting as reeds, across the mouth-piece. The harmonic series thusproduced, which depends on the„ P^^-^^o^^^ Service acoustic principles of the tube MahUlon) ^ ^^^ ^^ ^ absolutely uninfluenced by the manner in which the tubeis bent, forms a natural subdivision in classifying these instru-ments:—(i) Those in which the lower harmonics from thesecond to the sixth or eighth are employed, such as the bugle,post-horn, the cornet a pistons, the trombone. (2) Those inwhich the higher harmonics from the third or fourth to thetwelfth or sixteenth are mostly used, such as the French hornand trumpet. (3) Those which give out the fundamental toneand harmonics up to the eighth, such as the tubas and ophicleide. Harmonic Series—?. S ^ ^ ^ ^ Trumpet. .^ tlm. C^. JSi 4567Bugle an 8ve higher. I 10 II . 12 13 14 15 16 We thus find a fundamental difference between the trumpetand the bugle as regards the harmonic series. But although, tothe casual beholder, these instruments may present a generalsimilarity, there are other important structural tube of the trumpet is cylindrical, widening only at the bell,whereas that of the bugle, as stated above, is conical. Bothinstruments have cup-shaped mouthpieces outwardly peculiar shape of the basins, however, at the place wherethey open into the tube, angular in the trumpet and bevelledin the bugle, taken in conjunction with the bore of the maintube, gives to the trumpet its brilliant blaring tone, and to thebugle its more veiled but penetrating quality, characteristic ofthe whole family.^ Only five notes are required for the variousbugle-calls, although
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
