Biblioteca de la Guitarra y Cuerda Pulsada

Biblioteca de la Guitarra y Cuerda Pulsada

Autor: Daniel Sinier & Françoise de Ridder

The restoration of a guitar made by Antonio Stradivari in Cremona in 1679: the “Sabionari”

 39 3

Being aware of the historical importance of this instrument, its extreme rarity and its relatively badly preserved shape (successive repairs, numerous woodworm tunnels, etc.) the owner of this guitar would like to arrange a study of the future of this rare testimony, the instrument’s maintenance,  along with possible restoration and its preservation.

Only five of Stradivari’s guitars are still known to the world:

  • the “Hill” kept in the Ashmolean Museum, Oxford (GB)
  • the “Rawlins” kept in the National Music Museum in Vermillion (USA)
  • the « Vuillaume » kept in the Musée de la Musique de la Villette, Paris (France)
  • the « Giustiniani » kept in a private collection, Milan (Italy)
  • and the very “Sabionari” which is kept in another private collection in Milan (Italy)

These guitars are listed and thoroughly described in various publications except for the “Vuillaume”, kept in the Musée de la Musique de la Villette in Paris. It cannot be found in any comparison chart.  The “Vuillaume” was found in the collection of the illustrious Jean-Baptiste Vuillaume, a violin maker who was rather unpopular among museum administrators. This provenance cast a suspicious cloud over the guitar’s authenticity, just as happened with the violin “Le Messie” also made by Antonio Stradivari and which comes from the same collection and is now kept in Oxford.

Just as any Stradivari instrument, the Sabionari has been modified in order to keep up with the latest instrumental practices and turned into a six-string guitar around 1800. The neck has been changed and the panel on the head bearing the prestigious signature has been carefully re-integrated into a new “palette” head. Braces and linings have been added on the back. The bracing on the soundboard has been altered as well: the struts on the upper part of the belly as well as those crossed under the rose might be original. Two struts on the lower part have been added.

G. Marconcini (1) initiated the first alteration. The head’s and the bridge’s designs are very similar to those used by the skilful luthier for his guitars. Besides, the owner of the Sabionari at the time lived in Ferrare the town where Marconcini worked and it is only reasonable to assume that the owner entrusted his precious instrument to a competent and renowned luthier residing in his town.

150 years later a second intervention was necessary. Why reopen and restore the guitar? In order to fill and reinforce the damages caused by woodworms. The woods Marconcini used for the neck, the head, the linings and the braces were infested. The woodworm tunnels were numerous and substantial, they have been treated, filled and reinforced, sometimes patched with spruce studs or parchment. We do not know who did this repair but the work indicates a luthier of Spanish influence because of the typical studs that reinforce in some places the worm-eaten linings. We will not spark more controversy about the potential wood treatment which Stradivari used on his instruments but rather simply observe that the original wood, the soundboard in particular, has been spared by the worms. Furthermore we notice that the braces on the upper part of the belly, which have been described as perhaps non-original, have also been spared by the wood worms and that the belly is in a good state despite its age and the instrument’s general condition. During a guitar congress in 1948 the great guitarist Andrès Segovia signed the guitar’s back along with these words: “two centuries later…”

The owner of the Sabionari would like to have his guitar restored in order to:

- re-establish its original function and make it available to some soloists in a reasonable way so that we may retrieve and study the timbre of Stradivari’s guitars. The other guitars made by Stradivari which are set aside in public collections are only destined for exhibitions and silent observation. This one dates from 1679. It is the oldest guitar and its resonant box – still in its original size – would allow playing the baroque repertoire on a baroque instrument, finalized by the most famous luthier, and whose size and style differs considerably from other fully-preserved baroque guitars today.

  • restore its original size (the neck and the diapason) and its special aesthetics
  • replace its worm-eaten neck, check and stabilize the damages caused by the wood worms

Before deciding on a strategy of restoration and contemplating on the actions – most of them being irreversible – let’s read again the article written by Pollens (2) and Gregori (3). Their article is about a study of these instruments and the comparison charts they then assembled.

Thereby we can see that the size and measures of the Sabionari are the same as those of the “Hill” and the “Giustiniani”. We observe that Marconcini kept the triangular character of the original heel which he reproduced on the neck. Therefore we might think, through a reverse inference, that the Sabionari, as well as the “Hill” and the “Giustiniani”, originally had a distinct triangular heel, even if this is not the case with the separate neck which is kept in Cremona. According to Gregori, the edge purfling, bones and blackened wood do not seem authentic. We do not actually find a convincing argument confirming or disproving his conclusion, but replacing the “perhaps” non-original purfling with a non-original one, would not further jeopardize the belly and at the same time it would not achieve anything either. Still comparing the Sabionaris’ proportions with the others we realize that it has the same measurements as the “Hill” and thus must have the same long string length: 74 cm – diapason. Among the still existing but unidentified baroque guitars such a big diapason is quite rare and might be one of the specific features of Stradivari guitars.

We do not agree with Pollens and Gregori, and think that the neck, the head and the fingerboard are completely apocryphal and can be replaced. Since we lack sufficient experience with Stradivari’ varnish concerning guitars and violins, we line up behind the experts and consider the present varnish as the original one. A study with a Woods’ lamp clearly shows the retouches in places where the wormholes have been filled and a whitish orange varnish on the rest of the body, quite comparable with the UV results of the “Giustiniani” (4).

Furthermore we notice that in contrast to many other Italian baroque guitars, none of the Stradivari guitars has been changed into a “battente”- model with an angled table, a moving bridge and metal strings, secured on bone pins in the central panel at the lower rib junction.

We also have to consider the complex problem of the bracing. Guitars from that period usually have a strut free back which is at least 2 mm thick and there is no lining. Two struts can be found on the soundboard, one above and the second below the sound hole and sometimes two crossed smaller struts on the lower part of the belly, relics of old bracings. In order to re-establish the “Sabionari’s” initial interior we would have to open it, remove the struts from the back, check the struts of the belly which are not worm-eaten and take off the anachronistic struts of the belly’s lower part. Given the upcoming tension of the long strings, the worm holes that cross the back lengthwise and the big size of the guitar, it would be too risky to remove the struts from the back for the future setting of the strings. On the other hand it is highly problematic to open the guitar because worm holes can be found in the linings and the ribs and even if most of them are filled and patched, they are still numerous. Finally without reliable and authentic models there is no point in contemplating the modification of the bracing.

We x-ray the instrument to get a closer look at its state and at the repairs. The results come as no real surprise since it is possible to directly observe the instrument via the sound hole which is big enough to let a mirror through and because of the absence of a parchment rosette. Nevertheless we discover a third nail located at the very end of the original block. Sacconi (5) mentions that Stradivari used three nails for his violins and five for his celli. We can assume that Stradivari constructed his guitars with a big diapason with three nails. A question comes up though: Is the heel made of the same block as the neck, beneath the veneering, as it is the case with the quartet instruments? Do the three nails hold it? Or is the heel made of a different block adjusted against the grain to the neck, like it is done in the construction of lutes? We think that the heel is made of two against the grain pieces, just like lutes and mandolins even if, as far as we know, nobody tried to detach a small piece of the heels veneer for verification.

A comparison between the Sabionari and the Giustiniani via x-rays reveals the same high square heel (modified on the Sabionari), fairly similar struts on the upper part of the belly and those situated on the sides of the sound hole. The lower-block is also the same.

The previous repairs, although they do not allow to keep the guitar in its strictly original state, that is without struts on the back and on the lower part of the belly, may be maintained for the worm holes have been filled. Thus the repairs are now solid and long-lasting. They allow restoring a baroque neck and head. The belly is in an excellent state. Its average thickness is 2.3 mm, which is conventional. It never has been drilled for the setting up of six strings and allows the setting of a bridge for five double strings.

To avoid further risks, we and the owner of the Sabionari have decided, according to the principles of the patrimonial masterpieces restoration, that there is no need to open the box whose ribs are very distorted. We have therefore renounced on a “see for yourself” examination of the inner parts which would have been fascinating and enriching. Instead we have chosen to build a copy of the “Hills” neck and head whose sizes are the closest and to re-insert the panel bearing the Master’s signature.

Most likely any guitar maker would have been delighted to open this instrument to discover who knows which secret… But in order to string up the instrument so that it is playable, there clearly is only one suitable solution for the time being: one has to renounce opening this guitar and keep the current bracing. “This is a part of the instrument’s history” as the curators would say. None of Stradivari’s guitars kept its original bracing accessible thus we would not have the certainty and the models in order to construct a new bracing. But if one day we feel the need to open the guitar or if the restoration of the Giustiniani reveals his, what seems to be its authentic bracing, we can always open the guitar and:

  • change the inner studs which are far too thick
  • remove the anachronistic linings
  • change the bracing and put it back into the baroque position
  • extract the original top-block from the resonant box
  • level the cracks on the belly, the wood worm tunnels of the back and the ribs
  • and take the measurements and establish a precise technical drawing

This important work could be called ultra-interventionist not to say relentlessly technical/ therapeutic and we postpone it to a later date. We do not give in the syndrome “Il Canone”, Paganini’s violin made by Guarneri, kept at present in Geneva, and owing its name to his powerful sound. So far, “Il Canone” has intrigued every violin maker who got close to it and it probably is, in the attempt to reveal its secret, the most frequently opened instrument in the history of violin making.

We know that many guitars have been built in Cremona, made by Stradivari as well as by Amati and Guarneri and numerous documents from the museum of Cremona testify Stradivari interest in instruments which do not belong to the quartet. For instance a lot of head gauges, drawings and templates, etc. About 1680 the guitar is very in vogue all over Europe and we will add other baroque guitars to the comparison chart of the Stradivari guitars. Many of the Cremona guitars did not survive their time because the simple material: maple, spruce, wood purfling and missing sumptuousness decorations, plainly did not seduce the collectors.

We take off the Marconcini neck (neck/ heel are made of one block as for a quartet instrument) and we withdraw the two nails (the third had been cut during the 19th reassembling and completely set into the original block). This operation exposes numerous wood worm tunnels which, strangely enough, were not shown during the x-ray. The tunnels are very large and have extremely weakened the neck’s thickness and his solidity. Furthermore we notice that the rib structure closes under the neck, like on a violin.

We continue the lecture of Sacconis article and find out that, for his b/w/b purfling Stradivari used black coloured pear of 3/10 thickness and 6/10 poplar for the white parts. The black purfling is not made of ebony but of black coloured pear and the white parts are in poplar, however the dimensions differ decidedly. Once having checked the drawings of the “Rawlins” and the “Hill” we note that the purfling thickness vary on each guitar. Therefore we decide to make the purfling in order to match the neck to the dimensions of the box.

The restoration will proceed as follows:

  • take off the Marconcini neck/ head and the panel
  • to test wood worm tunnels and their fillings
  • to check the studs and the interior bonding
  • to carefully clean the lot
  • to treat and fill the wood worm tunnels that are still open and to patch them if necessary
  • to insert small pieces of wood in the cracks of the belly, studs and small plugs
  • to refill the external/outer worm tunnels where the mastic sunk
  • to renew the mastics colouring in the places where it has blackened, patina and colours

construction and setting of a new neck and head, to replace the pane turning of the pegs

  • new bridge by copying the “Hill” bridge and reproducing the moustaches of the Giustiniani (the traces of the same moustaches are still visible on the “Hill”)
  • gut frets, nuts, string setting

Appointments with the Oxford and Paris museum are taken in order to examine the two Stradivari with our own eyes. Thus we can see and feel the colours, the patina, the abrasion and the traces which will help us to make forget our new built neck most suitably …

The “Vuillaume” in Paris, is the only survivor made of humble materials and is spontaneously constructed. This guitar evokes a “bottom of the range” instrument affordable for a common musician less rich than most of famous luthier’s customers. Many quartet instruments, whose resonant box is made of poplar or another modest wood of the country, confirm this observation. Its date of construction is indefinite because Stradivari did not finish the panel. But the dendrochronology defines 1659 (6) for the earliest ring which could place its creation somewhere between 1670 and 1690. (It would be necessary to compare this with the violins dendros: How much time did pass between the last ring and the date on the label and how long between the cutting and use of the wood?) It seems that Stradivari kept some of the woods during 29 years for drying before he used them – see dendro of the “Messie” (7). The resonant box is made of cypress, a wood that was never used in the violin making craft in Cremona though quite common for guitars with very high ribs. The black wood that is veneered on the neck, the head and the fingerboard is not ebony but a strange black, very fibrous wood: of bog oak (8).

The neck’s purfling is made of maple. This guitar has been opened many times by removing the back and the belly. The belly’s edge purfling derives from a rarely used model; it is in a perfect state but apocryphal and has been added during the closing of the belly. Although the wood rose prevents the direct observation of the bracing, the restoration photos (endoscope) clearly indicate that the guitar has been re-set in the 19th century with six strings, with a six pegs bridge piercing the belly. Then it has been re-set with five double strings without any modification on the head. They also reveal completely anachronistic fir tree linings and 19th century struts on the belly and on the back. The head is made of poplar (or weak walnut), (the other guitars, except for the “Rawlins” were made of exactly the same wood), veneered with this black wood. The fingerboard’s edge purfling is bone-made in order to reinforce the side of the fingerboard which is always damaged by the frets. The bridge as well as the unlikely lined pegs is a contemporary work. The whole guitar has endured a drastic cleaning during the last reassembling which kept it with almost no varnish (traces) but an orange colour.

The “Hill” from Oxford, 1688:
In our opinion the “Hill” is the most beautiful and pure guitar that has survived. It comes from the Hill workshop whose restoration skills and expertise are unquestionable (just like the Vuillaume workshop). The engraving on the panel matches those of the Sabionari, Giustiniani, Vuillaume, Hill and the Rawlins: a specialized craftsman engraved the text using a template and stopped at the year’s first number. Then the master engraved the last three numbers to complete the date because they differ in texture. From one panel to the other, all the letters are made of an identical design which can only be achieved with a template. The procedure is simple: once the drawing of the letters is finished, they are hollowed out with a sharp tool and then the channels have to be filled with black mastic. The same method is used for the sound hole and the bridge. A similar principle is found on violin labels, the “1″ is printed and the following numbers are handwritten. The guitar is in a magnificently fresh state with its beautiful fine bright orange varnish. The belly has once been removed. This indicates the work of a violin maker. The coloured edge purfling was replaced to some extent by ebony during the closing. The back has never been undone from the ribs and the vellum which replaces the linings is intact. There are no struts on the back. The bracing on the belly is out of reach but seems to be coherent. The very beautiful rose prevents any examination and here, as well as in Paris, there is no opportunity to x-ray the instrument in order to look at the inside. The changing of a Stradivari’s bracing is a common procedure, only a few instruments can boast their authenticity. And what other reason might have been there for opening the guitar than to change the bracing? The inside of the instrument is quite clean and Stephen Barber noticed a restorer’s initials “JW”, dated 1914, under a strut of the belly which confirms the complete opening of the guitar.

As on the Vuillaume, the Giustiniani and the mandolin the “Coristo” (9), the black wood of the head and fingerboard is made of this strange black wood called bog oak and not of ebony. A similar type of wood is still used and sold in Germany but we do not know if it is the same wood Stradivari used to work with. Nevertheless, this confirms that ebony was rare in Cremona at the time and thus it was replaced by coloured wood: oak, pear, boxwood etc. Another scarce substance in Cremona was ivory and the small white ornaments that can be found on violins (for instants on the violin kept in the Ashmolean museum) and on guitars are made of bone and not of ivory. The “Hill”s head is made of poplar or Italian walnut, veneered with this bog oak and embellished with bone purfling, as on the Vuillaume. Its pegs are copies of 18th century Neapolitan pegs; we bet that the Hill workshop was inspired by one of the pretty mandolins that were part of their collection. The bridge however is probably authentic. The materials especially the purfling and the black paste which embeds the small bone pieces, are exactly similar, in pattern and in size, as those around the rose. The triangular tunnels lining the strings show a significantly diligent work and the elegancy of their design speak for themselves, even if the traces (they are hardly visible) left by the missing moustaches indicate that the belly has been aggressively cleaned. The frets on the fingerboard have been subsequently added. Through the end pin hole in the lower block, we were able to observe that the neck, as on the Sabionari, is held by three slanted nails so that they do not split the block.

Along with the Vuillaume and the Giustiniani, the “Hill” has two small filled holes that were necessary to fix the resonant box to the mould during construction. They also have the triangles in common which delimit the playing area at the belly’s upper part. Besides they also share the inverted hearts on the front’s lower part made from this mysterious wood.

We wanted to build a copy of the neck and head using the “Hill” drawings from the Oxford Museum, made by Stephen Barber in 1978. We took small templates along with us which we had produced from the drawings. But as soon as we put them on the neck we discovered that they did not entirely fit. The outlines were not really matching the original. So we changed our templates according to the authentic “Hill” neck. In addition we also took paper templates of the heel and its typical triangular profile.

We also built a copy of the Hill’s bridge. We do not agree with Stewart Pollens and think that the bridge is most likely authentic. The long delicate baroque guitar bridges, pulled by ten long stretched strings, usually come undone and are often lost. The procedure of making holes is above all used in the 18th century, especially in France but it is quite possible that it derives from Cremona. If a bridge template or drawing only shows small points instead of triangular string holes, it means that the luthier simply indicated the uppermost end of the holes; just as pegs are pointed out by small spots on head drawings. He then hollows out the holes when he assembles the guitar. This enables him to leave a huge surface for gluing, more resistant to the string tension, and also to give the guitarist the possibility to tune his instrument. This model surely is atypical but Stradivari is known to be innovative and might have designed this model. On the other hand, if Hill had built a new bridge he probably would have used ebony, just as he did with the purfling on the outline of the belly and he also would have replaced the bone with ivory. As for the choice of material and its dimension, the decoration is exactly the same and most of all the black mastic is not gum lack but a delicate mixture difficult to reproduce.

Once the Marconcini bridge is removed it leaves deep prints and we shall fill them with small spruce pieces in order to assure the bridge’s stability. Nevertheless the prints are still very visible and so we choose to cover them with moustaches that are identical to the Giustiniani
and those missing on the “Hill”.

It is interesting to notice that, in Cremona, Stradivari did not use ebony on his guitars or on his mandolins. He uses every material coming from the abattoir: gut for the strings, bones, tendons, skin and also hoofs which are used for making glue, as well as some putty, bones that replace ivory, bow hair and who knows what else. In our opinion, the mastic, with small sunken bone pieces, is made of burnt bones – like the black ivory mixed with glue which produces a black, slightly dull, but fine and smooth paste once being polished.

The removal of the panel is an important moment. The head is completely worm-eaten and the tunnels just stop at Stradivari’ veneer and even pierce it in some rare places. We remove it and glue it on a healthy veneer until we can put it on the new head’s back. We choose to make a poplar neck, a light and considerably sensitive wood, and we reinforce it by adding lengthwise wood pieces in order to assure its strength. Making a copy of the head and reinserting the panel is not a big issue. Two of the six maple pegs seem authentic as well as the maple end pin. A copy of the Hill’s rose is ordered from Elena Dal Cortivo …

As soon as we finished restoring the resonant box from the outside, we reinserted the new neck on the two nails pointing out from the rib structure. The struts and studs have been checked and glued back when necessary. We need to continue with the varnish repairs, the wood worm tunnels which have been more or less filled and embellish the patina on the damaged places and create a beautiful varnish on the neck/head. Exactly as Sacconi wrote in his book, we observe that the varnish comes back up during the cleaning and the warm orange colour returns while the cleaning cloth is turning into a greyish green. After that smaller settings follow concerning the strings, nuts and gut frets. We asked the Savarez Company to calculate the string length and baroque diapason. Then we string up the guitar and after everything has settled we ask a baroque guitarist to play this rare instrument for
the first time in years…

1 – Marconcini Guiseppe 1774 – 1841
He was Storioni’s apprentice and opened his own workshop in Ferrare. His work is well known and appreciated unanimously. His father, Luigi Aloisio, 1760-1791, was a pupil of Omobono Stradivari and there is a great demand for his work as well.

2 – Stewart Pollens :
2010 Cambridge University Press

 3 – Gianpaolo Gregori :
” La Harpe et les guitares d’Antonio Stradivarius”, Musique-Images- Instruments N.3
1997 CNRS Editions

 4 – La chitarra “Guistiniani” Antonio Stradivari 1681
Consirzio Liutai e Archettai
Antonio Stradivari – Cremona 1998

 5 – Simone F. Sacconi :
Les “Secrets” de Stradivarius.
Castelli et Bour’His Editeurs 1989

 6 – Dendrochronologie John Topham, 2000

 7 – Henri Grissino-Mayer : the dendrochronology made in December 2000 pointed out that
the tree from which the “Messie” had been built, was 112 years old (1577-1687). The violin
was made in 1716 which means that the wood had dried and aged in the master’s workshop
in Cremona for 29 years.
Journal of Archeological Science, vol 31, 2004

 8 – Ch. Beare : Expertise de la Vuillaume, Paris 17 juin 1993
Bog oak : has been immersed in turf for a long time which resulted in his deep and strong
black colour; this wood was used in Cremona and all over Italy in the 17th and 18th century.

9 – Il “Mandolino Coristo” di Antonio Stradivari , Cremone, 2002



Los enlaces publicados en La Biblioteca de la Guitarra solo tienen un fin educativo y de difusión, no comercial. Si algún compositor, intérprete o empresa, por cualquier motivo, considera que un archivo que aparece en este canal vulnera los derechos de autor, infórmenos y se eliminará.

0 Comentarios:

  • No hay comentarios

Las cookies nos ayudan a ofrecer nuestros servicios. Al utilizarlos, aceptas que usemos cookies. Más información