1.
Guitar
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The guitar is a musical instrument classified as a fretted string instrument with anywhere from four to 18 strings, usually having six. The sound is projected either acoustically, using a wooden or plastic and wood box, or through electrical amplifier. It is typically played by strumming or plucking the strings with the fingers, the guitar is a type of chordophone, traditionally constructed from wood and strung with either gut, nylon or steel strings and distinguished from other chordophones by its construction and tuning. There are three types of modern acoustic guitar, the classical guitar, the steel-string acoustic guitar, and the archtop guitar. The tone of a guitar is produced by the strings vibration, amplified by the hollow body of the guitar. The term finger-picking can also refer to a tradition of folk, blues, bluegrass. The acoustic bass guitar is an instrument that is one octave below a regular guitar. Early amplified guitars employed a body, but a solid wood body was eventually found more suitable during the 1960s and 1970s. As with acoustic guitars, there are a number of types of guitars, including hollowbody guitars, archtop guitars and solid-body guitars. The electric guitar has had a influence on popular culture. The guitar is used in a variety of musical genres worldwide. It is recognized as an instrument in genres such as blues, bluegrass, country, flamenco, folk, jazz, jota, mariachi, metal, punk, reggae, rock, soul. The term is used to refer to a number of chordophones that were developed and used across Europe, beginning in the 12th century and, later, in the Americas. The modern word guitar, and its antecedents, has applied to a wide variety of chordophones since classical times. Many influences are cited as antecedents to the modern guitar, at least two instruments called guitars were in use in Spain by 1200, the guitarra latina and the so-called guitarra morisca. The guitarra morisca had a back, wide fingerboard. The guitarra Latina had a sound hole and a narrower neck. By the 14th century the qualifiers moresca or morisca and latina had been dropped, and it had six courses, lute-like tuning in fourths and a guitar-like body, although early representations reveal an instrument with a sharply cut waist
2.
Spring (device)
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A spring is an elastic object used to store mechanical energy. Springs are usually out of spring steel. There are a number of spring designs, in everyday usage the term often refers to coil springs. When a spring is compressed or stretched from its resting position, the rate or spring constant of a spring is the change in the force it exerts, divided by the change in deflection of the spring. That is, it is the gradient of the force versus deflection curve, an extension or compression springs rate is expressed in units of force divided by distance, for example lbf/in or N/m. A torsion spring is a spring that works by twisting, when it is twisted about its axis by an angle, a torsion springs rate is in units of torque divided by angle, such as N·m/rad or ft·lbf/degree. The inverse of spring rate is compliance, that is, if a spring has a rate of 10 N/mm, the stiffness of springs in parallel is additive, as is the compliance of springs in series. Springs are made from a variety of materials, the most common being spring steel. Small springs can be wound from pre-hardened stock, while larger ones are made from annealed steel, some non-ferrous metals are also used including phosphor bronze and titanium for parts requiring corrosion resistance and beryllium copper for springs carrying electrical current. Simple non-coiled springs were used throughout history, e. g. the bow. In the Bronze Age more sophisticated spring devices were used, as shown by the spread of tweezers in many cultures, coiled springs appeared early in the 15th century, in door locks. The first spring powered-clocks appeared in that century and evolved into the first large watches by the 16th century, in 1676 British physicist Robert Hooke discovered Hookes law which states that the force a spring exerts is proportional to its extension. Compression spring – is designed to operate with a compression load, flat spring – this type is made of a flat spring steel. Machined spring – this type of spring is manufactured by machining bar stock with a lathe and/or milling operation rather than a coiling operation, since it is machined, the spring may incorporate features in addition to the elastic element. Machined springs can be made in the load cases of compression/extension, torsion. Serpentine spring - a zig-zag of thick wire - often used in modern upholstery/furniture, the most common types of spring are, Cantilever spring – a spring which is fixed only at one end. Coil spring or helical spring – a spring is of two types, Tension or extension springs are designed to become longer under load and their turns are normally touching in the unloaded position, and they have a hook, eye or some other means of attachment at each end. Compression springs are designed to become shorter when loaded and their turns are not touching in the unloaded position, and they need no attachment points
3.
Seesaw
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A seesaw is a long, narrow board supported by a single pivot point, most commonly located at the midpoint between both ends, as one end goes up, the other goes down. Mechanically, a seesaw is a lever and fulcrum, the most common playground design of seesaw features a board balanced in the center. A person sits on each end, and they take turns pushing their feet against the ground to lift their side into the air, playground seesaws usually have handles for the riders to grip as they sit facing each other. One problem with the design is that if a child allows himself/herself to hit the ground suddenly after jumping, or exits the seesaw at the bottom. For this reason, seesaws are often mounted above a surface such as foam or wood chips. Seesaws also are manufactured in shapes designed to look like other things, such as airplanes, helicopters, seesaws, and the eagerness of children to play with them, are sometimes used to aid in mechanical processes. For example, at the Gaviotas community in Colombia, a seesaw is connected to a water pump. Seesaws go by different names around the world. Seesaw, or its variant see-saw, is a direct Anglicisation of the French ci-ça, meaning literally, this-that, the term may also be attributable to the repetitive motion of a saw. It may have its origins in a combination of scie – the French word for saw with the Anglo-Saxon term saw, in most of the United States, a seesaw is also called a teeter-totter. According to linguist Peter Trudgill, the term originates from the Nordic language word tittermatorter, a teeter-totter may also refer to a two-person swing on a swing seat, on which two children sit facing each other and the teeter-totter swings back and forth in a pendulum motion. Both teeter-totter and seesaw demonstrate the process called reduplication, where a word or syllable is doubled. Reduplication is typical of words that indicate repeated activity, such as riding up, in the southeastern New England region of the United States, it is sometimes referred to as a tilt or a tilting board. Speakers in northeastern Massachusetts, United States, sometimes call them teedle boards, in the Narragansett Bay area the term changes to dandle or dandle board. This pattern suggests a New England term that spread down the coast, hickey-horse in the coastal regions of North Carolina is consistent with other linguistic and ethnic variations
4.
Weighing scale
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Weighing scales are devices to measure weight or calculate mass. Scales and balances are used in commerce, as many products are sold. Very accurate balances, called analytical balances, are used in fields such as chemistry. Although records dating to the 1700s refer to spring scales for measuring weight, the earliest design for such a device dates to 1770 and credits Richard Salter, an early scale-maker. Postal workers could work quickly with spring scales than balance scales because they could be read instantaneously. By the 1940s various electronic devices were being attached to these designs to make more accurate. A spring scale measures weight by reporting the distance that a spring deflects under a load and this contrasts to a balance, which compares the torque on the arm due to a sample weight to the torque on the arm due to a standard reference weight using a horizontal lever. Spring scales measure force, which is the force of constraint acting on an object. They are usually calibrated so that measured force translates to mass at earths gravity, the object to be weighed can be simply hung from the spring or set on a pivot and bearing platform. In a spring scale, the spring either stretches or compresses, by Hookes law, every spring has a proportionality constant that relates how hard it is pulled to how far it stretches. Rack and pinion mechanisms are used to convert the linear spring motion to a dial reading. With proper manufacturing and setup, however, spring scales can be rated as legal for commerce, to remove the temperature error, a commerce-legal spring scale must either have temperature-compensated springs or be used at a fairly constant temperature. To eliminate the effect of gravity variations, a spring scale must be calibrated where it is used. It is also common in high-capacity applications such as crane scales to use force to sense weight. The test force is applied to a piston or diaphragm and transmitted through hydraulic lines to an indicator based on a Bourdon tube or electronic sensor. A digital bathroom scale is a type of electronic weighing machine, the digital bathroom scale is a smart scale which has many functions like smartphone integration, cloud storage, fitness tracking, etc. In electronic versions of spring scales, the deflection of a beam supporting the weight is measured using a strain gauge. The capacity of such devices is only limited by the resistance of the beam to deflection and these scales are used in the modern bakery, grocery, delicatessen, seafood, meat, produce and other perishable goods departments
5.
Fred Frith
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Jeremy Webster Fred Frith is an English multi-instrumentalist, composer, and improvisor. Probably best known for his work, Frith first came to attention as one of the founding members of the English avant-rock group Henry Cow. He was also a member of the groups Art Bears, Massacre and he has also composed several long works, including Traffic Continues and Freedom in Fragments. Frith produces most of his own music, and has produced many albums by other musicians, including Curlew, the Muffins, Etron Fou Leloublan. Frith is the subject of Nicolas Humbert and Werner Penzels award-winning 1990 documentary Step Across the Border and he also appears in the Canadian documentary Act of God, which is about the metaphysical effects of being struck by lightning. Frith has contributed to a number of publications, including New Musical Express and Trouser Press. Friths career spans four decades and he appears on over 400 albums. He still performs actively throughout the world, currently Frith is Professor of Composition in the Music Department at Mills College in Oakland, California. He lives in the United States with his wife, German photographer Heike Liss, Frith was awarded the 2008 Demetrio Stratos Prize for his career achievements in experimental music. The prize was established in 2005 in honour of experimental vocalist Demetrio Stratos, of the Italian group Area, in 2010 Frith received an honorary doctorate from the University of Huddersfield in West Yorkshire, England in recognition of his contribution to music. Frith is the brother of Simon Frith, a critic and sociologist, and Chris Frith. Frith was born in Heathfield in Sussex, England into a family where music was considered a part of life. He started violin lessons at the age of five and became a member of his school orchestra, but at 13 he switched to guitar after watching a group imitating a popular instrumental band at the time, the Shadows. He decided to learn how to play guitar and get into a band, Frith taught himself guitar from a book of guitar chords and soon found himself in a school group called The Chaperones, playing Shadows and Beatles covers. Friths first public performances were in 1967 in folk clubs in the North of England, besides the blues, Frith started listening to any music that had guitar in it, including folk, classical, ragtime, and flamenco. He also listened to Indian, Japanese, and Balinese music and was drawn to East European music after a Yugoslav school friend taught him folk tunes from his home. Frith went to Cambridge University in 1967, where his musical horizons were expanded further by the philosophies of John Cage and Frank Zappas manipulation of rock music. Frith graduated from Christs College, Cambridge with a BA in 1970, Frith met Tim Hodgkinson, a fellow student, in a blues club at Cambridge University in 1968
6.
Gibson
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Gibson Brands, Inc. is an American manufacturer of guitars and other instruments, now based in Nashville, Tennessee. The company was known as Gibson Guitar Corp. and renamed Gibson Brands. Orville Gibson founded the company in 1902 as The Gibson Mandolin-Guitar Mfg. Co. Ltd. in Kalamazoo, Gibson invented archtop guitars by constructing the same type of carved, arched tops used on violins. By the 1930s, the company was also making flattop acoustic guitars, as well as one of the first commercially available hollow-body electric guitars, Gibson sells guitars under a variety of brand names and builds one of the worlds most iconic guitars, the Gibson Les Paul. Many Gibson instruments are highly collectible, Gibson was at the forefront of innovation in acoustic guitars, especially in the big band era of the 1930s, the Gibson Super 400 was widely imitated. In 1952, Gibson introduced its first solid-body electric guitar, the Les Paul which became its most popular guitar to date— designed by Ted McCarty, Gibson was owned by the Norlin corporation from 1969 to 1986. In 1986, the company was acquired by its present owners, Gibson is a privately held corporation owned by its chief executive officer Henry Juszkiewicz and its president David H. Berryman. Orville Gibson patented a single-piece mandolin design in 1898 that was more durable than other mandolins, Orville Gibson began to sell his instruments in 1894 out of a one-room workshop in Kalamazoo Michigan. In 1902 Gibson Mandolin-Guitar Mfg. Co, Ltd. was incorporated to market the instruments, initially, the company produced only Orville Gibsons original designs. Orville died in 1918 of endocarditis, the following year the company hired designer Lloyd Loar to create newer instruments. Loar designed the flagship L-5 archtop guitar and the Gibson F5 mandolin that was introduced in 1922, in 1936 Gibson introduced their first Electric Spanish model, the ES-150 followed by other electric instruments like steel guitars, banjos and mandolins. During World War II, instrument manufacturing at Gibson slowed due to shortages of wood and metal, between 1942-1945, Gibson employed women to manufacture guitars. Women produced nearly 25,000 guitars during World War II yet Gibson denied ever building instruments over this period, Gibson folklore has also claimed its guitars were made by seasoned craftsmen who were too old for war. In 1944 Gibson was purchased by Chicago Musical Instruments, the ES-175 was introduced in 1949. Gibson hired Ted McCarty in 1948, who became President in 1950, the Les Paul was offered in Custom, Standard, Special, and Junior models. In the mid-50s, the Thinline series was produced, which included a line of thinner guitars like the Byrdland, the first Byrdlands were slim, custom built, L-5 models for guitarists Billy Byrd and Hank Garland. Later, a neck was added. Other models such as the ES-350T and the ES-225T were introduced as less costly alternatives, in 1958, Gibson introduced the ES-335T model
7.
Pickup (music technology)
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The signal from a pickup can also be recorded directly, using a DI box or broadcast on the radio or television. Most electric guitars and electric basses use magnetic pickups, acoustic guitars, upright basses and fiddles often use a piezoelectric pickup. A magnetic pickup consists of a permanent magnet with a core of such as alnico or ferrite. The pickup is most often mounted on the body of the instrument, Magnetic pickups used with string basses can be attached to the bridge. The permanent magnet creates a field, the motion of the vibrating steel strings disturbs the field, changing magnetic flux. The pickup is then connected with a cable to an amplifier which amplifies the signal to a sufficient magnitude of power to drive a loudspeaker. A pickup can also be connected to recording equipment via a patch cable, there may also be an internal preamplifier device mounted in an acoustic guitar or in an external box. When a preamp is used in way, it is between the pickup and cable and can significantly reduce the equivalent impedance of the pickup coil. The output voltage of magnetic pickups varies between 100 mV rms to over 1 V rms for some of the higher output types, some high-output pickups achieve this by employing very strong magnets, thus creating more flux and thereby more output. This can be detrimental to the sound because the magnets pull on the strings can cause problems with intonation as well as damp the strings. Other high-output pickups have more turns of wire to increase the voltage generated by the strings movement, however, this also increases the pickups output resistance/impedance, which can affect high frequencies if the pickup is not isolated by a buffer amplifier or a DI unit. The turns of wire in proximity to each other have an equivalent self-capacitance that and this resonance can accentuate certain frequencies, giving the pickup a characteristic tonal quality. The more turns of wire in the winding, the higher the output voltage, the inductive source impedance inherent in this type of transducer makes it less linear than other forms of pickups, such as piezo-electric or optical. The tonal quality produced by this nonlinearity is, however, subject to taste, the external load usually consists of resistance and capacitance between the hot lead and shield in the guitar cable. The electric cable also has a capacitance, which can be a significant portion of the overall system capacitance and this arrangement of passive components forms a resistively-damped second-order low-pass filter. Single coil pickups act like an antenna and are prone to pick up mains hum along with the musical signal. Mains hum consists of a signal at a nominal 50 or 60 Hz, depending on local alternating current frequency. The changing magnetic flux caused by the mains current links with the windings of the pickup, the pickups also are sensitive to the electromagnetic field from nearby cathode ray tubes in video monitors or televisions
8.
Nut (string instrument)
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A nut, on a stringed musical instrument, is a small piece of hard material that supports the strings at the end closest to the headstock or scroll. The nut marks one end of the length of each open string, sets the spacing of the strings across the neck. Along with the bridge, the nut defines the vibrating lengths of the open strings, the nut may be made of ebony, ivory, cow bone, brass, Corian or plastic, and is usually notched or grooved for the strings. The grooves are designed to lead the string from the fingerboard to the headstock or pegbox in a smooth curve, bowed string instruments in particular benefit from an application of soft pencil graphite in the notches of the nut, to preserve the delicate flat windings of their strings. The word may have come from the German Nut, meaning groove or slot, in French, the nut is known as a fr, sillet, which, like German, can also translate to mean saddle. The Italian term, capo tasto, is the origin of the capo, not all string instruments have nuts as described, The nuts on some instruments are notched deeply enough that they are just string spacers. These instruments use a zero fret—a fret at the beginning of the scale where a normal nut would be that provides the correct string clearance, the zero fret is often found on less expensive instruments, as it is easier to set up an instrument this way. However, a zero fret also makes the sound of the open string similar to fretted notes, a conventional nut can make open strings sound slightly different—and for this reason some high-end instruments use a zero fret. String slots in a nut without a zero fret must be cut to the depth to make string height correct. Strings that are too low at the nut can buzz against the frets, some fretted instruments have a compensated nut. This type of nut provides better intonation across the instrument, the principle, given that strings are different thicknesses and have different tensions, the temperament of each fret is not 100% accurate for an equal temperament instrument. This is especially evident on the first few frets of an electric guitar, many guitar players notice how open position chords never sound in tune with each other. A compensated nut aims to correct this, by staggering the starting position of each string according to thickness, while not a complete solution such as a true temperament fretboard, there is a noticeable difference in tuning within chords. Many guitar companies, such as Music Man, and ESP include compensated nuts as standard on most of their instruments, another type is a locking nut. This nut—usually used in conjunction with a vibrato system such as a Floyd Rose or Kahler—clamps the strings against the nut. This improves tuning stability when using the vibrato bar, a drawback however, is that the locking nut must be loosened using an Allen wrench to tune outside the range of the fine tuners on the bridge. The erhu does not use a hard nut to define the length of the open string, but rather a qiān jin, a loop of string, or, less commonly. Some guitars have a rolling nut, in this design, made popular by the Fender company, the strings sit on roller bearings instead of nut slots
9.
Fret
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A fret is a raised element on the neck of a stringed instrument. Frets usually extend across the width of the neck. On most modern western fretted instruments, frets are metal strips inserted into the fingerboard, on some historical instruments and non-European instruments, frets are made of pieces of string tied around the neck. Frets divide the neck into fixed segments at intervals related to a musical framework, on instruments such as guitars, each fret represents one semitone in the standard western system, in which one octave is divided into twelve semitones. Fret is often used as a verb, meaning simply to press down the string behind a fret, fretting often refers to the frets and/or their system of placement. Pressing the string against the fret reduces the length of the string to that between the bridge and the next fret between the fretting finger and the bridge. This is damped if the string were stopped with the fingertip on a fretless fingerboard. Frets make it easier for a player to achieve an acceptable standard of intonation. Furthermore, a fretted fingerboard makes it easier to play chords accurately, a disadvantage of frets is that they restrict pitches to the temperament defined by the fret positions. A player may still influence intonation, however, by pulling the string to the side to increase string tension and this technique is often used by electric guitarists of all genres, and is an important part of sitar playing. On instruments with frets that are thicker off the fingerboard, string tension, sometimes a player can pull the string toward the bridge or nut, thus lowering or raising the string tension and pitch. However, except for instruments that accommodate extensive string pulling, like the sitar, since the intonation of most modern western fretted instruments is equal tempered, the ratio of the distances of two consecutive frets to the bridge is 212, or approximately 1.059463. Theoretically, the twelfth fret should divide the string in two exact halves, to compensate for the increase in string tension when the string is pressed against the frets, the bridge position is adjusted slightly so the 12th fret plays exactly in tune. Fan frets (also fanned frets, slanted frets, or multi-scale, Frets are generally perpendicular to the instruments neck centerline, on a fanned fretboard, the frets are angled with only one center fret perpendicular to the neck’s centerline. This gives the strings more length and the higher strings shorter length. The idea is to more accurate tuning and deeper bass. Some think that fanned frets might be more ergonomic, fanned frets first appeared on the 16th century Orpharion, a variant of the cittern, tuned like a lute. John Starrett revived the idea in the seventies on his innovative instrument
10.
Fingerboard
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The fingerboard is an important component of most stringed instruments. It is a thin, long strip of material, usually wood, the strings run over the fingerboard, between the nut and bridge. To play the instrument, a musician presses strings down to the fingerboard to change the vibrating length and this is called stopping the strings. Depending on the instrument and the style of music, the musician may pluck, on some instruments, notes can be sounded by the fretting hand alone, such as with hammer ons, an electric guitar technique. The word fingerboard in other languages sometimes occurs in musical directions, in particular, the direction sul tasto for bowed string instruments to play with the bow above the fingerboard. This reduces the prominence of upper harmonics, giving a more ethereal tone, a fingerboard may be fretted, having raised strips of hard material perpendicular to the strings, which the player presses the strings against to stop the strings. On modern guitars, frets are made of metal. Frets let the player stop the string consistently in the same place, as well, frets do not dampen string vibrations as much as fingers alone on an unfretted fingerboard. Frets may be fixed, as on a guitar or mandolin, or movable, fingerboards may also be unfretted, as they usually are on bowed instruments, where damping by the finger is of little consequence because of the sustained stimulation of the strings by the bow. Unfretted fingerboards allow a more control over subtle changes in pitch than fretted boards. Fingerboards may also be, though uncommon, a hybrid of these two, such a construction is seen on the sitar, where arched frets attach at the edges of a smooth fingerboard, unfrettable strings run inside the frets, while frettable ones run outside. A double dot or some other variation marks the 12th fret, variations on the standard dot shape can make a guitar more distinctive. Position markers are sometimes made luminescent to make more visible on stage. Position markers are sometimes repeated on the edge of the fingerboard for easy viewing. Over time, strings wear frets down, which can cause buzzing, fixing this occasionally requires replacing the frets—but more often they just need dressing. In fret dressing, a luthier levels and polishes the frets, stainless steel guitar frets may never need dressing, because of the density of the material. Not having frets carefully and properly aligned with the fingerboard can cause severe intonation issues, the ultimate way of determining the source of a buzz and detuning problem is to measure the levelness of the frets. A straightedge positioned on the neck in the lie of one of the strings should show nearly level frets, on bowed string instruments, the fingerboard is usually made of ebony, rosewood or other hardwood
