Pump organ - Wikipedia. John Church and Co. The pump organ, reed organ, harmonium, or melodeon is a type of free- reedorgan that generates sound as air flows past a vibrating piece of thin metal in a frame. The piece of metal is called a reed. More portable than pipe organs, free- reed organs were widely used in smaller churches and in private homes in the 1. The finer instruments have a unique[peacock term] tone, and the cabinets of those intended for churches and affluent homes were often excellent pieces of furniture. Several million free- reed organs and melodeons were made in the USA and Canada between the 1. During this time Estey Organ and Mason & Hamlin were popular manufacturers. History[edit]Christian Gottlieb Kratzenstein (1. Copenhagen, was credited with the first free- reed instrument made in the Western world, after winning the annual prize in 1. Imperial Academy of St. Original Article. Plasma Natriuretic Peptide Levels and the Risk of Cardiovascular Events and Death. Thomas J. Wang, M.D., Martin G. Larson, Sc.D., Daniel Levy, M.D. Original Article. Effects on Blood Pressure of Reduced Dietary Sodium and the Dietary Approaches to Stop Hypertension (DASH) Diet. Frank M. Sacks, M.D., Laura P. Petersburg.[1] The harmonium's design incorporates free reeds and derives from the earlier regal. A harmonium- like instrument was exhibited by Gabriel Joseph Grenié (1. The pump organ, reed organ, harmonium, or melodeon is a type of free-reed organ that generates sound as air flows past a vibrating piece of thin metal in a frame. Breast Cancer Survivorship: A Comprehensive Review of Long-Term Medical Issues and Lifestyle Recommendations. “Rediscovery of Early Twentieth-Century Ecotheology”, Open Theology. An open access article about the early history of eco-theology, 1900-1954, leading up to. The mouse has become an important animal model in understanding cochlear function. Structures, such as the tectorial membrane or hair cells, have been changed by gene.He called it an orgue expressif (expressive organ), because his instrument was capable of greater expression, as well as of producing a crescendo and diminuendo. Alexandre Debain improved Grenié's instrument and gave it the name harmonium when he patented his version in 1. There was concurrent development of similar instruments.[3] A mechanic who had worked in the factory of Alexandre in Paris emigrated to the United States and conceived the idea of a suction bellows, instead of the ordinary bellows that forced the air outward through the reeds. Beginning in 1. 88. Mason & Hamlin, of Boston made their instruments with the suction bellows, and this method of construction soon superseded all others in America.[2]. Beatty's Parlor Organ, 1. Harmoniums reached the height of their popularity in the West in the late 1. They were especially popular in small churches and chapels where a pipe organ would be too large or too expensive; in the funeral- in- absentia scene from Mark Twain's The Adventures of Tom Sawyer, the protagonist narrates that the church procured a "melodeum" (a conflation, likely intended by Twain for satirical effect, of the names "melodeon" and "harmonium") for the occasion. Harmoniums generally weigh less than similar sized pianos and are not as easily damaged in transport, thus they were also popular throughout the colonies of the European powers in this period not only because it was easier to ship the instrument out to where it was needed, but it was also easier to transport overland in areas where good- quality roads and railways may have been non- existent. An added attraction of the harmonium in tropical regions was that the instrument held its tune regardless of heat and humidity, unlike the piano. This "export" market was sufficiently lucrative for manufacturers to produce harmoniums with cases impregnated with chemicals to prevent woodworm and other damaging organisms found in the tropics. Modern portable harmonium with 9 air stop knobs. At the peak of the instruments' Western popularity around 1. These ranged from simple models with plain cases and only four or five stops (if any at all), up to large instruments with ornate cases, up to a dozen stops and other mechanisms such as couplers. Expensive harmoniums were often built to resemble pipe organs, with ranks of fake pipes attached to the top of the instrument. Small numbers of harmoniums were built with two manuals (keyboards). Some were even built with pedal keyboards, which required the use of an assistant to run the bellows or, for some of the later models, an electrical pump. These larger instruments were mainly intended for home use, such as allowing organists to practise on an instrument on the scale of a pipe organ, but without the physical size or volume of such an instrument. For missionaries, chaplains in the armed forces, travelling evangelists, and the like, reed organs that folded up into a container the size of a very large suitcase or small trunk were made; these had a short keyboard and few stops, but they were more than adequate for keeping hymn singers more or less on pitch. The invention of the electronic organ in the mid- 1. West (although its popularity as a household instrument declined in the 1. The Hammond organ could imitate the tonal quality and range of a pipe organ whilst retaining the compact dimensions and cost- effectiveness of the harmonium as well as reducing maintenance needs and allowing a greater number of stops and other features. By this time, harmoniums had reached high levels of mechanical complexity, not only through the need to provide instruments with a greater tonal range, but also due to patent laws (especially in North America). It was common for manufacturers to patent the action mechanism used on their instruments, thus requiring any new manufacturer to develop their own version; as the number of manufacturers grew, this led to some instruments having hugely complex arrays of levers, cranks, rods and shafts, which made replacement with an electronic instrument even more attractive. The last mass- producer of harmoniums in North America was the Estey company, which ceased manufacture in the mid- 1. Italian companies continued into the 1. As the existing stock of instruments aged and spare parts became hard to find, more and more were either scrapped or sold. It was not uncommon for harmoniums to be "modernised" by having electric blowers fitted, often very unsympathetically. The majority of Western harmoniums today are in the hands of enthusiasts, though the instrument remains popular in South Asia. Modern electronic keyboards can emulate the sound of the pump organ. Acoustics[edit]. Two reeds from a reed organ. The acoustical effects described below are a result of the free- reed mechanism. Therefore, they are essentially identical for the Western and Indian harmoniums and the reed organ. In 1. 87. 5, Hermann von Helmholtz published his seminal book, On the Sensations of Tone, in which he used the harmonium extensively to test different tuning systems: [4]"Among musical instruments, the harmonium, on account of its uniformly sustained tone, the piercing character of its quality of tone, and its tolerably distinct combinational tones, is particularly sensitive to inaccuracies of intonation. And as its vibrators also admit of a delicate and durable tuning, it appeared to me peculiarly suitable for experiments on a more perfect system of tones."[5]Using two manuals and two differently tuned stop sets, he was able to simultaneously compare Pythagorean to just and to equal- tempered tunings and observe the degrees of inharmonicity inherent to the different temperaments. He subdivided the octave to 2. This arrangement was difficult to play on.[7] Additional modified or novel instruments were used for experimental and educational purposes; notably, Bosanquet's Generalized keyboard was constructed in 1. In practice, that harmonium was constructed with 8. Another famous reed organ that was evaluated was built by Poole.[8]Lord Rayleigh also used the harmonium to devise a method for indirectly measuring frequency accurately, using approximated known equal temperament intervals and their overtonebeats.[9] The harmonium had the advantage of providing clear overtones that enabled the reliable counting of beats by two listeners, one per note. However, Rayleigh acknowledged that maintaining constant pressure in the bellows is difficult and fluctuation of the pitch occurs rather frequently as a result. Portable 1. 9th- century reed organ with one rank of reeds. In the generation of its tones, a reed organ is similar to an accordion or concertina, but not in its installation, as an accordion is held in both hands whereas a reed organ is usually positioned on the floor in a wooden casing (which might make it mistakable for a piano at the very first glimpse). Reed organs are operated either with pressure or with suction bellows. Pressure bellows permit a wider range to modify the volume, depending on whether the pedaling of the bellows is faster or slower. In North America and the United Kingdom, a reed organ with pressure bellows is referred to as a harmonium, whereas in continental Europe, any reed organ is called a harmonium regardless of whether it has pressure or suction bellows. As reed organs with pressure bellows were more difficult to produce and therefore more expensive, North American and British reed organs and melodeons generally use suction bellows and operate on vacuum. Reed organ frequencies depend on the blowing pressure; the fundamental frequencydecreases with medium pressure compared to low pressure, but it increases again at high pressures by several hertz for the bass notes measured.[1. American reed organ measurements showed a sinusoidal oscillation with sharp pressure transitions when the reed bends above and below its frame.[1. The fundamental itself is nearly the mechanical resonance frequency of the reed.[1. The overtones of the instrument are harmonics of the fundamental, rather than inharmonic,[1. The fundamental frequency comes from a transversemode, whereas weaker higher transverse and torsional modes were measured too.[1. Any torsional modes are excited because of a slight asymmetry in the reed's construction. During attack, it was shown that the reed produces most strongly the fundamental, along with a second transverse or torsional mode, which are transient.[1. Radiation patterns and coupling effects between the sound box and the reeds on the timbre appear not to have been studied to date. The unusual reed- vibration physics have a direct effect on harmonium playing, as the control of its dynamics in playing is restricted and subtle.
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