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Double-reed Instruments
A double reed is a type of reed used to produce sound in various wind instruments. In contrast with a single reed instrument, where the instrument is played by channeling air against one piece of cane which vibrates against the mouthpiece and creates a sound, a double reed features two pieces of cane vibrating against each other. This means, for instruments with the double reed fully exposed, that the air flow can be controlled by the embouchure from the top, bottom and sides of the reed. The term ''double reeds'' can also refer collectively to the class of instruments which use double reeds. Structure and dimensions The size and shape of the reed depend on the type of double-reed instrument which is of two groups, conical and cylindrical. Even within families of instruments, for example, the oboe family, the reed for the oboe is quite different from that for the cor anglais (English horn). Oboe reeds are usually 7 mm (0.3 in) in width, while bassoon reeds are wider, from 13.5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vesica Piscis
The vesica piscis is a type of lens, a mathematical shape formed by the intersection of two disks with the same radius, intersecting in such a way that the center of each disk lies on the perimeter of the other. In Latin, "" literally means "bladder of a fish", reflecting the shape's resemblance to the conjoined dual air bladders (swim bladder) found in most fish. In Italian, the shape's name is ' ("almond"). A similar shape in three dimensions is the lemon. This figure appears in the first proposition of Euclid's ''Elements'', where it forms the first step in constructing an equilateral triangle using a compass and straightedge. The triangle has as its vertices the two disk centers and one of the two sharp corners of the vesica piscis. Mathematical description Mathematically, the vesica piscis is a special case of a lens, the shape formed by the intersection of two disks. The mathematical ratio of the height of the vesica piscis to the width across its center is the squar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dulzaina
The dulzaina () is a Spanish double reed instrument in the oboe family. It has a conical shape and is the equivalent of the Breton bombarde. It is often replaced by an oboe or a double reeded clarinet as seen in Armenian and Ukrainian folk music. Many varieties of the dulzaina exist in Spain. In the Valencian Community, it is known as a ''dolsaina'' or ''xirimita'' and is accompanied by a drum called the ''tabalet''. The Catalan variety of the dulzaina is called a '' gralla'', and the Basque variety is called a ''bolin-gozo''. In the region of Aragon, especially in the town of Huesca, the dulzaina is played along with ''gaitas de boto'', regional bagpipes, and sometimes drums. The instrument was first introduced in Spain through Arabic people. The dulzaina is also heard in a large portion of the region of |
Flutter Tongue
Flutter-tonguing is a wind instrument tonguing technique in which performers flutter their tongue to make a characteristic "FrrrrrFrrrrr" sound. The effect varies according to the instrument and at what volume it is played, ranging from cooing sounds on a recorder to an effect similar to the growls used by jazz musicians. Notation In sheet music, the technique is usually indicated with the standard tremolo markings on a note alongside a text instruction to flutter the note. The German marking "Flatterzunge" is often abbreviated to "Flz." or "Flt.". The Italian "frullato" is sometimes abbreviated to "frull". In English, the most common indication is "f.t." Other markings that composers have used to indicate flutter tonguing include: coupe de lange roulé, en roulant la langue, tremolo dental, tremolo avec la langue, tremolo roulé, vibrata linguale, vibrando, and colpo di lingua among others. However, simply writing (3-line) tremolo marks on all rhythmic values without other ind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cork (material)
Cork is an impermeable buoyant material. It is the phellem layer of bark tissue which is harvested for commercial use primarily from '' Quercus suber'' (the cork oak), which is native to southwest Europe and northwest Africa. Cork is composed of suberin, a hydrophobic substance. Because of its impermeable, buoyant, elastic, and fire retardant properties, it is used in a variety of products, the most common of which is wine stoppers. The montado landscape of Portugal produces approximately half of the cork harvested annually worldwide, with Corticeira Amorim being the leading company in the industry. Cork was examined microscopically by Robert Hooke, which led to his discovery and naming of the cell. Cork composition varies depending on geographic origin, climate and soil conditions, genetic origin, tree dimensions, age (virgin or reproduction), and growth conditions. However, in general, cork is made up of suberin (average of about 40%), lignin (22%), polysaccharid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reed (music)
A reed (or lamella) is a thin strip of material that vibrates to produce a sound on a musical instrument. Most woodwind instrument reeds are made from '' Arundo donax'' ("Giant cane") or synthetic material. Tuned reeds (as in harmonicas and accordions) are made of metal or synthetics. Musical instruments are classified according to the type and number of reeds. The earliest types of single-reed instruments used idioglottal reeds, where the vibrating reed is a tongue cut and shaped on the tube of cane. Much later, single-reed instruments started using heteroglottal reeds, where a reed is cut and separated from the tube of cane and attached to a mouthpiece of some sort. By contrast, in an uncapped double reed instrument (such as the oboe and bassoon), there is no mouthpiece; the two parts of the reed vibrate against one another. Single reeds Single reeds are used on the mouthpieces of clarinets and saxophones. The back of the reed is flat and is placed against the mouthpiece. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bocal
A bocal or crook is a curved, tapered tube, which is an integral part of certain woodwind instruments. These include double reed instruments such as the bassoon, contrabassoon, English horn, and oboe d'amore, as well as the larger recorders. In the double reed instruments, the bocal connects the reed to the rest of the instrument; in the case of larger recorders, the bocal directs air from the player's mouth to the fipple. Bocals can be made from a variety of metals, including nickel silver, brass, sterling silver, or even gold, and are covered at the lower end with a cork sleeve, allowing the bocal to fit tightly in the socket at the top of the instrument. More recently, at least one maker is producing bocals made of hardwood.{{cite web, url=http://www.robertronnes.com/paraschos.bassoonbocal.html, title=Paraschos Bassoon Bocal, website=robertronnes.com, archiveurl=https://web.archive.org/web/20071230111246/http://www.robertronnes.com/paraschos.bassoonbocal.html, archivedate=2007 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mandrel
A mandrel, mandril, or arbor is a tapered tool against which material can be forged, pressed, stretched or shaped (e.g., a ring mandrel - also called a triblet - used by jewellers to increase the diameter of a wedding ring), or a flanged or tapered or threaded bar that grips a workpiece to be machined in a lathe. A flanged mandrel is a parallel bar of a specific diameter with an integral flange towards one end, and threaded at the opposite end. Work is gripped between the flange and a nut on the thread. A tapered mandrel (often called a plain mandrel) has a taper of approximately 0.005 inches per foot and is designed to hold work by being driven into an accurate hole on the work, gripping the work by friction. A threaded mandrel may have a male or female thread, and work which has an opposing thread is screwed onto the mandrel. On a lathe, mandrels are commonly mounted between centres and driven by a lathe dog (typically flanged or tapered mandrels), but may also be gripped in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polypropylene
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer Propene, propylene. Polypropylene belongs to the group of polyolefins and is Crystallization of polymers#Degree of crystallinity, partially crystalline and Chemical polarity#Nonpolar molecules, non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat-resistant. It is a white, mechanically rugged material and has a high chemical resistance. Polypropylene is the second-most widely produced Commodity plastics, commodity plastic (after polyethylene). History Phillips Petroleum chemists J. Paul Hogan and Robert Banks (chemist), Robert Banks first demonstrated the polymerization of propylene in 1951. The stereoselective polymerization to the isotactic was discovered by Giulio Natta and Karl Rehn in March 1954. This pioneering discovery led to large-scale commercial producti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Borassus
''Borassus'' (palmyra palm) is a genus of five species of fan palms, native to tropical regions of Africa, Asia, and Papua New Guinea. Description These massive palms can grow up to high and have robust trunks with distinct leaf scars; in some species, the trunk develops a distinct swelling just below the crown, though for unknown reasons. The leaves are fan-shaped, long, with spines along the petiole margins (no spines in ''B. heineanus''). The leaf sheath has a distinct cleft at its base, through which the inflorescences appear; old leaf sheaths are retained on the trunk, but fall away with time. All ''Borassus'' palms are dioecious, with male and female flowers on separate plants; male flowers are less than long and in semicircular clusters, sandwiched between leathery bracts in pendulous catkins; female flowers are wide, globe-shaped and solitary, sitting directly on the surface of the inflorescence axis. The fruits are wide and roughly spherical, and each contains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phragmites Australis
''Phragmites australis'', known as the common reed, is a species of flowering plant in the grass family Poaceae. It is a wetland grass that can grow up to tall and has a cosmopolitan distribution worldwide. Description ''Phragmites australis'' commonly forms extensive stands (known as reed beds), which may be as much as or more in extent. Where conditions are suitable it can also spread at or more per year by horizontal runners, which put down roots at regular intervals. It can grow in damp ground, in standing water up to or so deep, or even as a floating mat. The erect stems grow to tall, with the tallest plants growing in areas with hot summers and fertile growing conditions. The leaves are long and broad. The flowers are produced in late summer in a dense, dark purple panicle, about long. Later the numerous long, narrow, sharp pointed spikelets appear greyer due to the growth of long, silky hairs. These eventually help disperse the minute seeds. Taxonomy Recent stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
