The Bass Bar

The Luthier's Apprentice

Chapter 15: The Bass Bar

The bass bar is invisible. Once the violin is assembled, once the top plate is glued to the ribs and the back plate is glued to the ribs and the body is closed and the neck is attached and the strings are strung, no one will see the bass bar. No audience member, no performer, no collector, no appraiser will see it. The bass bar exists inside the violin, glued to the underside of the top plate, running roughly parallel to the left f-hole, a strip of spruce approximately 270 millimeters long and 6 millimeters wide and 12 millimeters tall at its highest point, tapering to nothing at each end, a small piece of wood inside a larger piece of wood inside an assembly of wood that constitutes the body of the instrument, and the smallness of the bass bar is disproportionate to its importance, because the bass bar is essential, is foundational, is one of the elements without which the violin would not sound like a violin, would not project, would not balance, would not be the instrument it is.

Giovanni explained this to Nadia on a February morning, the workshop cold despite the radiators, the February cold of the Po Valley different from the December cold, deeper, wetter, the fog that rolled in from the river settling on the city and persisting for days, the fog making the world outside the workshop windows a gray wash, a blurred canvas, the buildings on Via Palazzo reduced to shapes, the streetlights reduced to halos, and the reduction of the visible world seemed to Nadia appropriate for the lesson of the bass bar, which was a lesson about the invisible, about the things that cannot be seen but that determine everything.

The bass bar transmits the vibrations of the lower strings through the top plate. This is its function. When the bow draws across the G string or the D string, the string vibrates and the vibration passes through the bridge into the top plate, and the top plate vibrates, and the vibration would stay local, would remain concentrated in the area immediately beneath the bridge, would not spread through the entire plate, if not for the bass bar, which acts as a conduit, a channel, a pathway for the vibrations, spreading them from the bridge region to the far ends of the plate, the bass bar distributing the energy of the vibration across the full length of the soundboard, and the distribution is the projection, the projection that allows a solo violin to be heard in a concert hall seating two thousand people, the projection that is not merely loudness but presence, the quality of the sound that fills the space, that reaches the last row, that makes the listener in the balcony feel that the instrument is playing for them.

Giovanni carved the bass bar from a piece of spruce. The same spruce as the top plate, the same wood, the same grain orientation, the bass bar's grain running in the same direction as the plate's grain, the matching of grain direction essential because the bass bar and the plate must vibrate sympathetically, must respond to the same frequencies in the same way, the bass bar amplifying the plate's vibration rather than dampening it, and the amplification requires the matching, the matching of material, the matching of grain, the matching of properties.

He carved with the knife. The small knife, the coltello with the pear-wood handle, the knife that had cut the f-holes, the knife that was Giovanni's most personal tool. He carved the spruce strip into the shape of the bass bar, the shape that was long and narrow and tapered, the cross-section roughly triangular, the triangle's base flat (the surface that would be glued to the plate) and the triangle's apex rounded (the surface that would face the interior of the acoustic chamber). The carving was precise, the dimensions measured with calipers at multiple points along the length, the dimensions conforming to Giovanni's standard, which was his own standard, developed over fifty years of fitting bass bars and listening to the results.

He handed the knife to Nadia. He handed her a piece of spruce. He pointed to the bass bar he had carved and then to the blank piece of spruce and the pointing was the instruction: make one. Make a bass bar. Not for the violin, for practice. Make one so that your hands learn the shape and the dimensions and the carving and the fitting, so that when you make a bass bar for an instrument that matters, the making will be practiced, and the practiced will have memory.

She carved. The knife in her right hand, the spruce in her left, the carving a new application of the knife, different from the f-hole filing, different from the planing, different from the gouging, each application requiring a different grip, a different angle, a different pressure, the knife adaptable because the knife is the most versatile tool, the tool that can cut and carve and trim and shape, the tool that follows the hand's intention with the least mediation, the blade an extension of the fingers, the fingers directing the blade with the immediacy of thought.

The bass bar took shape under her knife. The shape was rough, approximate, the dimensions inexact, the taper uneven, the cross-section more rectangular than triangular, the work of a beginner, the work that was not yet practiced, that did not yet have memory, that was being done for the first time, and the first time is always the crudest time, the time when the hands do not yet know what they are doing and the mind knows but cannot tell the hands, and the gap between the mind's knowledge and the hands' ability is the apprenticeship, and the apprenticeship is the closing of the gap, and the closing takes time, and the time is the months, and the months are the work.

Giovanni watched her carve. He did not correct her during the carving. He waited until she set the knife down and held up the practice bass bar and looked at it with the critical eye she was developing, the eye that could now see the difference between her work and his, the difference that was visible in the proportions and the surfaces and the symmetry, the eye that was learning to see the way the hands were learning to carve, the seeing and the carving developing in parallel.

He took her practice bass bar. He held it next to his. The two bass bars side by side, the comparison visible, his slender and tapered and smooth, hers thick and uneven and rough. He did not say the comparison. He showed the comparison. The showing was the teaching, the visual instruction that bypassed language and entered through the eyes.

She took the practice bar back. She carved more. She shaved the surfaces, thinned the profile, refined the taper, and the refining was the learning, the progressive approach to the correct shape, the shape that Giovanni's bar represented, the shape that was the standard, and the standard was being approached, slowly, incrementally, the increments measured in shavings of spruce that fell to the bench and accumulated in a small pile that was the physical evidence of the learning.

The fitting. The bass bar must be fitted to the underside of the top plate, the flat surface of the bar conforming to the curved surface of the plate's interior, and the conforming requires carving the bar's base to match the plate's curvature, the matching achieved by a process called chalk fitting, in which the surface of the plate is rubbed with chalk and the bar is pressed against it and the chalk transfers to the high spots on the bar's surface, the high spots being the areas that contact the plate and that must be carved away to allow the bar to sit flush, the flush sitting being the prerequisite for a good glue joint, the good glue joint being the prerequisite for the acoustic connection between the bar and the plate.

Giovanni demonstrated the chalk fitting. He rubbed the interior surface of the top plate with a stick of white chalk, the chalk leaving a thin, even coating on the spruce. He placed the bass bar against the chalked surface, pressed it down, lifted it away. On the base of the bar, where the chalk had transferred, white marks appeared, the marks showing the points of contact, the points where the bar's base touched the plate's surface. He carved these points with the knife, removing a whisper of wood, lowering the high spots. He pressed the bar against the plate again. More chalk transferred. He carved again. He pressed again. The process repeated, iterative, each iteration bringing the bar's base closer to the plate's curvature, each iteration adding more chalk marks, more points of contact, the contact increasing with each iteration until the base of the bar was covered in chalk, indicating full contact, indicating that the bar's base conformed to the plate's interior surface.

The process took an hour. One hour of pressing and marking and carving and pressing again, the iterative refinement that was the fitting, the fitting that was the craft, the craft of making two surfaces meet, of bringing two pieces of wood into contact so intimate that the glue between them would be a film rather than a fill, a membrane rather than a mass, the thin film of hide glue that would bond the bar to the plate acoustically as well as structurally, the acoustic bond requiring the intimacy of the contact, the intimacy that the chalk fitting achieved.

Nadia fitted her practice bass bar to a practice plate. The process was the same: chalk, press, mark, carve, repeat. The process was meditative, was repetitive, was the kind of work that quieted the mind the way scales quiet the mind, the repetition producing a state of focused calm, the calm of the hands doing the same thing over and over with small variations, the variations the learning, the learning the progress, the progress the approach to the correct fit.

Her fitting was not as good as Giovanni's. The chalk marks were fewer, the contact incomplete, the bar sitting on the plate with gaps visible at the edges, gaps that would compromise the glue joint, gaps that would weaken the acoustic connection. But the fitting was better than it would have been a month ago, and the better was the thing, the measurable improvement that was the apprenticeship's evidence, the evidence that the hands were learning, that the mind was translating, that the apprentice was becoming.

Giovanni glued the bass bar. He heated the hide glue, applied it to the bar's base and to the plate's interior surface, pressed the bar into position, and clamped it. The clamping required special clamps, long-reach clamps that could reach inside the plate to press the bar against the interior surface, the clamps applying pressure from the outside of the plate through the f-holes, the f-holes serving as access ports, as windows through which the clamps could reach the interior, the f-holes functional even before the instrument was assembled, functional as access, as entry points for the tools that would complete the work on the interior.

The bar was glued. The clamps held it. The glue set. Another invisible element fixed in place, another essential component hidden from view, another piece of the acoustic puzzle assembled inside the instrument where no eye would see it and every ear would hear it.

Nadia stood at the bench and she looked at the top plate with its bass bar clamped to its interior, and she thought about the invisible. She thought about all the things inside the violin that no one would see: the bass bar, the sound post that would be set later, the graduation of the plates, the interior surfaces that she and Giovanni had carved, the surfaces that faced each other when the body was closed, the surfaces that formed the interior of the acoustic chamber, the chamber that was the heart of the instrument, the heart that was hidden, the hidden that was essential.

The essential things in a violin are invisible. This was the lesson. Not a lesson Giovanni stated, not a principle he articulated, but a truth that the work revealed through the doing, the truth that emerged from the carving and the fitting and the gluing of the bass bar, the truth that the bass bar embodied: the things that make the violin what it is are the things you cannot see.

She thought about the other invisible things. The sound post, the small cylindrical dowel that would be placed inside the body after assembly, wedged between the top plate and the back plate, positioned just behind the right foot of the bridge, the sound post transmitting the vibrations from the top plate to the back plate, connecting the two acoustically, coupling them, the coupling essential for the violin's characteristic sound, the sound that is the product of both plates vibrating together, the top plate producing and the back plate reflecting, and the sound post the link between them, the tiny wooden cylinder that was, in acoustic terms, the most important single component of the instrument, the component that determined the balance between treble and bass, the component whose position could be adjusted by fractions of a millimeter to change the instrument's voice, and the component was invisible, was inside, was hidden.

She thought about the graduation. The precise variation in thickness across the top and back plates, the variation that she had measured with calipers at twenty points, the variation that determined the vibrational modes of the plates, the modes that produced the overtones that gave the violin its character, its richness, its complexity, the acoustic fingerprint that distinguished one violin from another, and the graduation was invisible, was inside the plates, was the internal structure of the wood itself, the structure that no one could see from the outside but that everyone could hear.

She thought about the interior surfaces. The surfaces she had watched Giovanni carve, the surfaces she had helped sand, the surfaces that were smooth and precisely shaped and that would face each other across the narrow space of the acoustic chamber, the surfaces that would never be seen again once the body was closed, the surfaces that existed in permanent darkness, in the interior of the instrument, in the space where the sound was born.

The things that make the violin what it is are the things you cannot see.

She thought about her hand. The left hand. The hand that looked normal, that appeared functional, that passed every visual inspection, the hand that was, from the outside, indistinguishable from any other hand, the injury invisible, the dystonia invisible, the neurological reorganization invisible, the loss invisible, and yet the loss was the defining feature of her life, the thing that had changed everything, the thing that had brought her to Cremona, and the thing was invisible, was inside, was hidden in the neural pathways of the motor cortex, hidden in the garbled signals, hidden in the reorganized map of the brain that no scan could read with sufficient resolution to see the damage, the damage that was not a lesion or a tear or a break but a remapping, a rearrangement, an invisible change that produced visible consequences, the visible consequence being the inability to trill, to vibrate, to shift, the visible consequence being the end of the performing career.

The essential things are invisible. The bass bar. The sound post. The graduation. The injury. The things that determine the character, the quality, the voice, the capability. The things that cannot be seen but that can be heard, can be felt, can be known through their effects, the effects being the sound in the case of the violin and the silence in the case of the hand.

She set down the knife. She looked at the practice bass bar, the bar she had carved and fitted, the bar that was not as good as Giovanni's but that was an improvement on her first attempt, the improvement the evidence of the learning, the learning the evidence of the time, the time the evidence of the commitment, the commitment invisible and essential, the commitment the bass bar of her apprenticeship, the thing that held everything together, the thing that transmitted the vibrations of the experience through the structure of the days, the thing that no one could see and that made everything possible.

February continued. The fog continued. The work continued. The invisible things continued to be made, to be fitted, to be glued into place inside the instrument that was becoming the violin, the violin that was Giovanni's last, the last violin, the final expression of a craft that had been practiced for four generations on Via Palazzo and for five centuries in Cremona, the craft that was invisible in its essentials and visible in its effects, the craft that existed in the space between the hidden and the heard, the space that was the instrument, the space that was the workshop, the space that was the apprenticeship.

And the apprenticeship was the learning of the invisible.

And the invisible was the essential.

And the essential was the craft.