The harmonica, also known as a French harp or mouth organ, is a free reed wind instrument used worldwide in many musical genres, notably in blues, American folk music, classical music, jazz, country, and rock. The many types of harmonica include diatonic, chromatic, tremolo, octave, orchestral, and bass versions. A harmonica is played by using the mouth to direct air into or out of one holes along a mouthpiece. Behind each hole is a chamber containing at least one reed. The most common is the diatonic Richter-tuned with ten air passages and twenty reeds, often called the blues harp. A harmonica reed is a flat, elongated spring typically made of brass, stainless steel, or bronze, which is secured at one end over a slot that serves as an airway. When the free end is made to vibrate by the player's air, it alternately blocks and unblocks the airway to produce sound.
A pan flute is a musical instrument based on the principle of the closed tube, consisting of multiple pipes of gradually increasing length. Multiple varieties of pan flutes have been popular as folk instruments. The pipes are typically made from bamboo, giant cane, or local reeds. Other materials include wood, plastic, metal and ivory.
A loudspeaker is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. A speaker system, also often simply referred to as a speaker or loudspeaker, comprises one or more such speaker drivers, an enclosure, and electrical connections possibly including a crossover network. The speaker driver can be viewed as a linear motor attached to a diaphragm which couples that motor's movement to motion of air, that is, sound. An audio signal, typically from a microphone, recording, or radio broadcast, is amplified electronically to a power level capable of driving that motor in order to reproduce the sound corresponding to the original unamplified electronic signal. This is thus the opposite function to the microphone; indeed the dynamic speaker driver, by far the most common type, is a linear motor in the same basic configuration as the dynamic microphone which uses such a motor in reverse, as a generator.
A shofar is an ancient musical horn typically made of a ram's horn, used for Jewish religious purposes. Like the modern bugle, the shofar lacks pitch-altering devices, with all pitch control done by varying the player's embouchure. The shofar is blown in synagogue services on Rosh Hashanah and at the end of Yom Kippur; it is also blown every weekday morning in the month of Elul running up to Rosh Hashanah. Shofars come in a variety of sizes and shapes, depending on the choice of animal and level of finish.
The kazoo is an American musical instrument that adds a "buzzing" timbral quality to a player's voice when the player vocalizes into it. It is a type of mirliton, one of a class of instruments which modifies its player's voice by way of a vibrating membrane of goldbeater's skin or material with similar characteristics.
A shakuhachi is a Japanese longitudinal, end-blown flute that is made of bamboo. The bamboo end-blown flute now known as the shakuhachi was developed in Japan in the 16th century and is called the fuke shakuhachi (普化尺八). A bamboo flute known as the kodai shakuhachi or gagaku shakuhachi (雅楽尺八) was derived from the Chinese xiao in the Nara period and died out in the 10th century. After a long blank period, the hitoyogiri shakuhachi (一節切尺八) appeared in the 15th century, and then in the 16th century, the fuke shakuhachi was developed in Japan. The fuke shakuhachi flourished in the 18th century during the Edo period, and eventually the hitoyogiri shakuhachi also died out. The fuke shakuhachi developed in Japan is longer and thicker than the kodai shakuhachi and has one finger hole less. It is longer and thicker than hitoyogiri shakuhachi and is superior in volume, range, scale and tone quality. Today, since the shakuhachi generally refers only to fuke shakuhachi, the theory that the shakuhachi is an instrument unique to Japan is widely accepted.
A tweeter or treble speaker is a special type of loudspeaker that is designed to produce high audio frequencies, typically deliver high frequencies up to 100 kHz. The name is derived from the high pitched sounds made by some birds (tweets), especially in contrast to the low woofs made by many dogs, after which low-frequency drivers are named (woofers).
Glassblowing is a glassforming technique that involves inflating molten glass into a bubble with the aid of a blowpipe. A person who blows glass is called a glassblower, glassmith, or gaffer. A lampworker manipulates glass with the use of a torch on a smaller scale, such as in producing precision laboratory glassware out of borosilicate glass.
A magnetic cartridge, more commonly called a phonograph cartridge or phono cartridge or (colloquially) a pickup, is an electromechanical transducer that is used to play records on a turntable.
The end-blown flute is a woodwind instrument played by directing an airstream against the sharp edge of the upper end of a tube. Unlike a recorder or tin whistle, there is not a ducted flue voicing, also known as a fipple. Most rim-blown flutes are "oblique" flutes, being played at an angle to the body's vertical axis. A notched flute is an end-blown flute with a notch on the blowing surface. A lip-valley flute is a type of notched flute.
A noisemaker is something intended to make a loud noise, usually for fun. Instruments or devices commonly considered "noisemakers" include:
Strapping, also known as bundling and banding, is the process of applying a strap to an item to combine, stabilize, hold, reinforce, or fasten it. A strap may also be referred to as strapping. Strapping is most commonly used in the packaging industry.
An air handler, or air handling unit, is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. An air handler is usually a large metal box containing a blower, furnace or A/C elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU, sometimes exhausting air to the atmosphere and bringing in fresh air. Sometimes AHUs discharge (supply) and admit (return) air directly to and from the space served without ductwork
A snow globe is a transparent sphere, traditionally made of glass, enclosing a miniaturized scene of some sort, often together with a model of a town, neighborhood, landscape or figure. The sphere also encloses the water in the globe; the water serves as the medium through which the "snow" falls. To activate the snow, the globe is shaken to churn up the white particles. The globe is then placed back in its position and the flakes fall down slowly through the water. Snow globes sometimes have a built-in music box that plays a song. Some snow globes have a design around the outerbase for decoration. Snow globes are often used as a collectible item.
A silo is a structure for storing bulk materials. Silos are used in agriculture to store fermented feed known as silage, not to be confused with a grain bin, which is used to store grains. Silos are commonly used for bulk storage of grain, coal, cement, carbon black, woodchips, food products and sawdust. Three types of silos are in widespread use today: tower silos, bunker silos, and bag silos.
A forced-air central heating system is one which uses air as its heat transfer medium. These systems rely on ductwork, vents, and plenums as means of air distribution, separate from the actual heating and air conditioning systems. The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating. The supply plenum directs air from the central unit to the rooms which the system is designed to heat. Regardless of type, all air handlers consist of an air filter, blower, heat exchanger/element/coil, and various controls. Like any other kind of central heating system, thermostats are used to control forced air heating systems.
The vuvuzela is a horn, with an inexpensive injection-moulded plastic shell about 65 centimetres (2 ft) long, which produces a loud monotone note, typically around B♭ 3. Some models are made in two parts to facilitate storage, and this design also allows pitch variation. Many types of vuvuzela, made by several manufacturers, may produce various intensity and frequency outputs. The intensity of these outputs depends on the blowing technique and pressure exerted. The indoor noise level caused the U.S. NCAA to permanently ban them after the February 7, 1987 Division I Men's Ice Hockey game between Brown University at Rensselaer Polytechnic Institute. The noise was so extreme from the 2 ft long cherry-red plastic horns that Brown formally complained and "The RPI Rule" was universally adopted.
An infrared heater or heat lamp is a heating appliance containing a high-temperature emitter that transfers energy to a cooler object through electromagnetic radiation. Depending on the temperature of the emitter, the wavelength of the peak of the infrared radiation ranges from 750 nm to 1 mm. No contact or medium between the emitter and cool object is needed for the energy transfer. Infrared heaters can be operated in vacuum or atmosphere.
The chromatic trumpet of Western tradition is a fairly recent invention, but primitive trumpets of one form or another have been in existence for millennia; some of the predecessors of the modern instrument are now known to date back to the Neolithic era. The earliest of these primordial trumpets were adapted from animal horns and sea shells, and were common throughout Europe, Africa, India and, to a lesser extent, the Middle East. Primitive trumpets eventually found their way to most parts of the globe, though even today indigenous varieties are quite rare in the Americas, the Far East and South-East Asia. Some species of primitive trumpets can still be found in remote places, where they have remained largely untouched by the passage of time.
A blowtorch, also referred to as a blowlamp, is an ambient air fuel-burning gas lamp used for applying flame and heat to various applications, usually metalworking.
