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The curious disposition of the original double-manual harpsichord has been the subject of considerable speculation since 1739, but especially so over the past fifty years. The problem, simply stated, runs as follows.
A concise account of historical harpsichord ranges, 2017
The historical evolution of the extension of the harpsichord's 12-note-per-octave keyboard, through the Middle Ages, Renaissance and Baroque eras, in the main local traditions. (For a discussion of ""enharmonic keyboards"" or ""split sharps"", see the author's book ""Unequal Temperaments: Theory, History and Practice"", 3nd ed. 2013, Section 5.4. http://temper.braybaroque.ie/. For a full discussion of multiple-division keyboards see the same book, Chapter 19.) This paper was published in NEMA Newsletter, i/1. This is an online publication by the National Early Music Association UK. The whole issue is freely available to the general public from the URL: http://www.earlymusic.info/NEMA_Newsletter_i1_2017.pdf
"Taskin Harpsichord Scalings and Stringings Revisited, 2011", March 2011, in a webpage by the author (see links)., 2011
French double-manual harpsichords are in wide use today, especially those based upon the widely admired extant originals by Pascal Taskin. In this paper the scaling and original stringing of Taskin’s instruments—and a few other French Baroque instruments—is scrutinised in different ways. A first conclusion is that there appears to be no justification for a grouping of Taskin’s instruments in “low pitch” and “high pitch”. A second conclusion is that there is no direct correlation between pitch and Taskin’s changes in case sizes and scalings: he partially compensated for these changes by suitably modifying the stringing lists. The third conclusion is that the presumed inconsistency of Taskin’s stringing lists appears also to be a myth: with reasonable pitch assumptions, his tension curves show great similarity, being also similar to those calculated for other 18th century French instruments. The fourth conclusion, highly relevant for the harpsichord maker, is provided in the form of a unified, reliable and accurate method for the calculation of stringing lists for modern instruments based on 18th century French originals. Hints to select the Taskin original to be copied are also provided. This file has been converted from the original webpage (see Links). The present PDF format should be more legible in some computers and especially so in portable devices.
2008
There is an absolute maximum length a string can have in order to produce a specific note without breaking. For the higher notes of a plucked-string keyboard instrument this can be barely enough for the jacks and registers that need to fit within the limited space between nut and bridge. Particularly problematic are situations such as a range that extends to f''' or higher, the presence of 4' or 2' registers, a high number of jack rows or a short scale, such as found on brass strung instruments or those intended for a high pitch standard. Also, the process of ravalement might require some degree of contrivance to deal with problems that the original maker didn’t have to worry about. Another consequence of the limited available space is that, whatever solution is found for the higher notes, the maker has a restricted degree of freedom for choosing the plucking points in this region. Sometimes, in order to gain some extra space, the maker resorts to a change in the string material (with divided bridges and/or nuts) or simply an increased scaling for this portion of the instrument. Registers which are in the farthest position from the nut can become nearer from the bridge, making the sound more nasal for the last notes, as opposed to what would be expected. This paper examines different solutions found on a number of specific instruments and discusses their implications as far as the timbre of the top octave is concerned.
2009
One of the harpsichords recently donated by the late Roger Mirrey to the Edinburgh University Collection of Musical Instruments is the only instrument known to be signed «Alessandro Cresci», a maker from whom virtually nothing is known. This instrument shows similarities with those of the Cristofori circle, but a number of its characteristics are not very common. The cypress soundboard is unusual for as late a date as 1760. Like in the much earlier Thewes claviorgan, its jacks run through holes cut into the soundboard, so that the proximal bridges rest on free soundboard. The topmost 16 notes of the 4' string set rest on a separated proximal bridge. The instrument, which is no longer in working condition, shows several layers of workmanship, and it appears to have been very crudely tampered with in recent times. A large hole sawn into the baseboard allows easy observation of the inner structure, including what seem to be latter reinforcements and several vestiges on the underside of the soundboard. The keyboard is patchwork: the front of many keys appears to have been cut and replaced in different places. The whole instrument is puzzling in many ways. This paper describes the Cresci harpsichord, putting forward and discussing, on the basis of the research work done so far, some hypothesis in relation to this instrument's history and the reasons of its uniqueness.
2013
At the Edinburgh University Collection of Historical Instruments (EUCHMI) there are two virginals where the strings are plucked extremely close to 1/4 of their length over a substantial part of the compass. Principles of Acoustics dictate that in such cases the fourth partial of the resulting sound is unlikely to be produced with any appreciable magnitude. Similar situations affecting different partials also occur when the plucking point is located at other fractional parts of the string length, such as 1/3 or 1/5. A database of plucking points, based on museum catalogues, was created and analysed, so that pitch regions are identified where such phenomena are likely to occur for different categories of instruments. The main cue used in harpsichord tuning is related to beat phenomena produced by partials of two simultaneously played notes, whenever there is a small difference between their frequencies. Partial four being relevant for major thirds and perfect fourths, these intervals may result less accurate, or less reliably tuned, in instruments like the above virginals. Historical sources were surveyed for expressions which describe the cues that tuners were supposed to use in identifying the ideal of an interval. Although expressions such as Schwebungen are mostly related with beats, broader meanings are discussed. Hints of the use of alternative, not beat-related cues, are identified. A series of practical tuning experiments was performed in which selected intervals were tuned, the accuracy of the tuning process being assessed from recordings, which were subjected to spectral analysis. Only cues that could be related to historical sources were used. The effects of factors such as pitch, pitch region, instrument, interval type, and particularly the potential absence of relevant partials were investigated, statistical methods playing a substantial role in the research. A logbook was created, where the experimenter detailed the cues used for each tuned interval in one of the experiments. The recorded information provided some insight into a number of strategies a tuner may use for coping with difficulties in cases of absent or weak partials. The impact of inharmonicity on the exact size of just intervals was also examined, both on theoretical grounds and based on data from the experiments. A number of case studies were included, where a comparison was made between missing partial notes predicted from plucking points and the degree of absence of those partials in the actual spectra for some historical instruments.""
The Galpin Society Journal, 1994
... It was bought by the Russell Collection from Mrs Martha Steedman, who received it in 1967 as a gift in memory of her mother from her father, the Rev. John Hamilton. ... Bi-a 1.5 E6l-c' 1.5 a-e3 1.1 4ft G,g 1.1 Gc 1.1 Gc 1.1 GB 1.2 1.5 3.8-3.9 go1-e3 0.9 c-e3 0.9 ...
Journal of the Acoustical Society of America, 1995
Standards Committee S12 on Noise. Working group chairs will report on their progress for the production of noise standards. The interaction with ISO/TC 43/SC1 and ISO/TC 94/SC12 activities will also be discussed, with reference to the international standards under preparation. the Chairs of the respective U.S. Technical Advisory Groups (H. E. von Gierke and E. H. Berger) will report on current activities of these international Technical Subcommittees under ISO. Scope of S12: Standards, specifications and terminology in the field of acoustical noise pertaining to methods of measurement, evaluation and control; including biological safety, tolerance and comfort and physical acoustics as related to environmental and occupational noise.
Perspectives on Early Keyboard Music and Revival in the Twentieth Century, 2018
Presents a summary of new findings since the 1979 catalogue of 17th-century French harpsichord music was published. Includes references to previously published inventories and corrections, and presents new inventories for other sources. Lists all known sources as of 2017. Dedicated to Kenneth Gilbert.
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