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See also:KEYBOARD, or See also:MANUAL (Fr. clavier; Ger. Klaviatur; Ital. tastatura)
, a See also:succession of keys for unlocking See also:sound in stringed, See also:wind or percussion musical See also:instruments, together with the See also:case or See also:board on which they are arranged
.
The two See also:principal types of See also:keyboard instruments are the See also:organ and the piano; their keyboards, although similarly constructed, differ widely in See also:scope and capabilities
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The keyboard of the organ, a purely See also:mechanical contrivance, is the See also:external means of communicating with the valves or pallets that open and See also:close the entrances to the pipes
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As its See also:action is incapable of variation at the will of the performer, the keyboard of the organ remains without See also:influence on the quality and intensity of the sound
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The See also: The invention of the keyboard with balanced keys has been placed by some writers as See also:late as the 13th or 14th century, in spite of its having been described by both See also:Hero of See also:Alexandria and See also:Vitruvius and mentioned by poets and writers . The misconception probably arose from the easy See also:assumption that the organ was the product of Western skill and that the primitive instruments with sliders found in Ilth_century documents' represent the sum of the progress made in the evolution; in reality they were the result of a laborious effort to reconquer a lost See also:art . The earliest trace of a balanced keyboard we possess is contained in Hero's description of the See also:hydraulic organ said to have been invented by Ctesibius of Alexandria in the 2nd century B.c . After describing the other parts (see ORGAN), Hero passes on to the sliders with perforations corresponding with the open feet of the speaking pipes which, when drawn forward, See also:traverse and See also:block the pipes . He describes the following contrivances: attached to the slider is a three-limbed, pivoted See also:elbow-key, which, when depressed, pushes the slider inwards; in See also:order to provide for its automatic return when the See also:finger is lifted from the key, a slip of See also:horn is attached by a gut See also:string to each elbow-key . When the key is depressed and the slider pushed See also:home, the gut string pulls the slip of horn and straightens it . As soon as the key is released, the piece See Musurgia, bk . II., iv . § 3 . ' Thes . Antiq . Sacra .
(See also:Venice, 1744-1769), xxxii
.
477
.
II
.
3 and fol. to, 2
.
`Arakhin (" Valuations ") is a treatise in the Babylonian See also:Talmud
.
The word Magrephah occurs in the Mishna, the description of the instrument in the gemdrd
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See the Cividale See also:Prayer See also:Book of St See also: The pipes were flue-pipes . A similar little instrument, having tiny invisible pipes furnished with beatin reeds and a pair of bellows (therefore requiring two performers) was known as the See also:regal . There are representations of these See also:medieval balanced keyboards with keys of various shapes, the most See also:common being the rectangular with or without rounded corners and the T-shaped . Until the 14th century all the keys were in one See also:row and of the same level, and although the B See also:flat was used for modulation, it was merely placed between A and B natural in the sequence of notes . During the 14th century small square additional keys made their See also:appearance, one or two to the See also:octave, inserted between the others in the position of our See also:black keys but not raised . An example of this keyboard is reproduced by J . F . Riano' from a See also:fresco in the Cistercian monastery of Nuestra Senora de Piedra in See also:Aragon, dated 1390 . So far the history of the keyboard is that of the organ . The only stringed instruments with keys before this date were the See also:organistrum and the hurdy-gurdy, in which little See also:tongues of See also:wood manipulated by handles or keys performed the function of the fingers in stopping the strings on the See also:neck of the instruments, but they did not influence the development of the keyboard . The See also:advent of the immediate precursors of the See also:pianoforte was at hand . In the Wunderbuch' (1440), preserved in the See also:Grand Ducal Library at See also:Weimar, are represented a number of musical instruments, all named . Among them are a clavichordium and a clavicymbalum with narrow additional keys let in between the wider ones, one to every See also:group of two large keys . The same arrangement prevailed in a clavicymbalum figured in an See also:anonymous MS. attributed to the 14th century, preserved in the public library at See also:Ghent'; from the lettering over the jacks and strings, of which there are but eight, it would seem as though the See also:draughts-See also:man had See also:left the accidentals out of the See also:scheme of notation . These are the earliest known representations of instruments with keyboards . The exact date at which our See also:chromatic keyboard came into use has not been discovered, but it existed in the 15th century and may be studied in the picture of St See also:Cecilia playing the organ on the Ghent altarpiece painted by the See also:brothers See also:Hubert and See also:Jan See also:van See also:Eyck . See also:Praetorius distinctly states that the large See also:Halberstadt organ had the keyboard which he figures (plates See also:xxiv. and See also:xxv.) from the outset, and reproduces the inscription asserting that the organ was built in 1361 by the See also:priest See also:Nicolas Fabri and was renovated in 1495 by Gregorius Kleng . The keyboard of this organ has the arrangement of the See also:present See also:day with raised black notes; it is not improbable that Praetorius's statement was correct, for See also:Germany and the Nether-lands led the van in organ-See also:building during the See also:middle ages . At the beginning of the 16th century, to facilitate the playing of contrapuntal See also:music having a See also:drone See also:bass or point d'orgue, the arrangement of the pipes of organs and of the strings of spinets and harpsichords was altered, with the result that the lowest octave of the keyboard was made in what is known as See also:short measure, or mi, re, ut, i.e. a diatonic with B flat included, but grouped in the space of a See also:sixth instead of appearing as a full octave . In order to carry out this See also:device, the See also:note below F was C, instead of E, the missing D and E and the B flat being substituted for the three sharps of F, G and A, and appearing as black notes, thus: DEBb CF G A B C, or if the lowest note appeared to be B, it sounded as G and the arrangement was as follows: . |
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