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A micro perforated plate (MPP) is a device used to absorb sound, reducing its intensity. It consists of a thin flat plate, made from one of several different materials, with small holes punched in it. An MPP offers an alternative to traditional sound absorbers made from porous materials.
Bell plates are made of sheets of aluminium, steel or bronze, ranging in size from 100 by 74 centimetres (39 by 29 in) and 30 kilograms (66 lb) (bronze) to 28 by 25 centimetres (11.0 by 9.8 in) and 1 kilogram (2.2 lb) (aluminium).
When the ribbon reaches the end of the process it is scored, or cut, and then removed for further processing in discrete sheets of flat glass. The "bulb edges" are recycled as cullet (flawed glass which is remelted) or were resold for shelving or displays. Sometimes flawed parts of the sheets were removed, leaving behind decent quality flat glass.
Bombs on London recorded on an aluminum disc by the British Broadcasting Corporation in 1940 on display at the CBC Museum. In the field of audio recording, an aluminum disc (aluminium in the UK and elsewhere) is a phonograph (gramophone in the UK) record made of bare aluminum, a medium introduced in the late 1920s for making one-off recordings.
In December 1877, [5] Thomas Edison and his team invented the phonograph using a thin sheet of tin foil wrapped around a hand-cranked, grooved metal cylinder. [6] Tin foil was not a practical recording medium for either commercial or artistic purposes, and the crude hand-cranked phonograph was only marketed as a novelty, to little or no profit.
Instead of using a steel mantle and cement, the inner and outer moulds can also be made completely out of loam. In that case, the moulds are usually constructed inside out—first the inner mould on top of a coke, stone, or brick core, then the false bell including wax decorations as above, and finally the outer mould with added iron ring and ...
The quest for new sounds led the Baschet brothers to combine new materials of the time, usually through folding metal sheets into geometric shapes. Their sculptures range from small folded sheet metal of a few centimeters up to structures several meters high with loud, impressive and complex sounds.
Set of bell plates, range C2–E4, a struck idiophone (played with mallets) or friction idiophone (bowed) Claves (foreground), a struck idiophone. An idiophone is any musical instrument that creates sound primarily by the vibration of the instrument itself, without the use of air flow (as with aerophones), strings (chordophones), membranes (membranophones) or electricity (electrophones).