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Review: Research Papers in Violin Acoustics 1975–1993

Review: Research Papers in Violin Acoustics, 1975-1993 edited by Carleen Hutchins and Virginia Benade

Reviewed by David Hurd

Originally published in American Lutherie #59, 1999 and Big Red Book of American Lutherie Volume Five, 2008



Research Papers in Violin Acoustics 1975–1993
Carleen Maley Hutchins, Editor
Virginia Benade, Associate Editor
Acoustical Society of America,
ISBN 1563966093

It is with some trepidation that I pen this, my first book review for American Lutherie. As I noted to Tim Olsen, “But I’ve never made or even played a violin. How can I review such books and do them justice?” “Well,” he replied, “most of our readers are in the same position. And, having written the review, you can keep the books.” So began several months of fascinated reading of this two-volume set of violin research papers.

A little over half of the papers in this collection are from the Journal of the Catgut Acoustical Society, Series 1 or 2 and the Society Newsletter. Both the Society and the journal are still alive, well, and active in mostly violin family instrument research. The remainder of the articles come from such technical journals as: Journal of the Acoustical Society of America, Acustica, Journal of the Acoustical Society of Japan, Journal of Audio Engineering, Journal of the Violin Society of America, Scientific American, Wood Science and Technology, Acoustics Australia, Acta Metallica, Music Perception, American Journal of Physics, Interdisciplinary Science Review, Strad, and Physics Today. Papers from the proceedings of several conferences on acoustics and modal analysis are also represented.

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Product Reviews: Livos Oil Finish

Product Reviews: Livos Oil Finish

by Fred Carlson

Originally published in American Lutherie #63, 2000 and Big Red Book of American Lutherie Volume Six, 2013



Livos Oil Finish

I’ve experimented with my share of different finishing materials over the twenty-odd years (twenty-eight, to be exact, and some of them have been very odd indeed) that I’ve been building wooden stringed instruments. From my early years working with my artist/luthier mentor Ken Ripportella, I remember various concoctions of linseed oil and beeswax; later came guitar building with all sorts of awful chemicals, starting with automotive acrylic lacquer and soon moving on to the more standard nitrocellulose brew. It took some years to get advanced to the point that we had an actual exhaust fan to draw the toxic solvent fumes out of the shop, and during one of those years I had a bed on a small loft above my workbench, next to the finishing room. When finishing was going on, I was breathing lacquer fumes day and night. By the time we finally got the exhaust fan and I learned how to use a respirator, a certain amount of damage had been done, and I began to experience a lot of discomfort when exposed to lacquer/solvent fumes, as well as other chemicals. Although I had no idea then that my ignorance would compromise my health, perhaps for the rest of my life, it became pretty obvious pretty fast that I couldn’t work around solvent-based finishes anymore. I had continued to use oil and wax finishes on some instruments, but had not been completely happy with either the acoustic or protective qualities of those finishes when applied to the top of a guitar. I’d taken to using oil and wax for everything but the top, for which I was using nitrocellulose until the mid‑’80s. My sensitivity problems caused me to switch to one of the early waterborne lacquer-like polymers, similar to what I still use today.

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In Memoriam: Frederick Thomas Dickens

In Memoriam: Frederick Thomas Dickens

1935 – 2000

by Pauline Dickens, James Jones, and Graham Caldersmith

Originally published in American #71, 2002 and Big Red Book of American Lutherie Volume Six, 2013

Frederick Thomas Dickens was born January 10, 1935 in Bogalusa, Louisiana, and died November 8, 2000 in Lynchburg, Virginia. He served in the Navy and attended Southwestern Louisiana Institute (now USL) in Lafayette, Louisiana, where he graduated with a degree in physics. He went to work for Western Electric at Bell Laboratories in Whippany, New Jersey, in 1960, then worked for AT&T/Bell Labs from 1962 until his retirement in 1987. He was married and had two children.

From early childhood Fred was always taking things apart and rebuilding them: crystal sets, model airplanes and boats, small engines, large engines, bicycles, motorbikes, air rifles, most anything that had plenty of parts. In later years, he continued to take things apart and reassemble them or build new and improved ones. His crystal set was replaced by powerful shortwave radios, the model airplanes and boats got larger and more sophisticated, the small engines became single-cylinder miniature hit-and-miss ones. The large engines were built to fit into the motorcycle frames that he constructed and competed on in observed trials. The air rifles became more powerful and accurate, and Fred built all parts on his lathe and milling machine, even to checkering the stocks. His latest pistol was used to shoot uncooked pasta at carpenter bees feeding on the house. The bicycle evolved into an elaborate recumbent design that he was working on when he died.

While at Bell Labs he worked in the Power Supply Department building power supplies for the transatlantic cable. His power supplies were also found in many of AT&T’s telephones. He received the Distinguished Technical Staff Award for Sustained Achievement in 1984.

He first got interested in instrument building in 1966 when he built his first guitar. He took apart an old guitar he had purchased in Mexico when he was twelve to study the construction. He began keeping detailed records with guitar #15 in 1968, using red cedar for the top. Ever the stickler for words, he wrote, “The cedar will be called ‘Egyptian Dragoon Brown Spruce’ from the Aswan Dam Preserve.” He began making his fretboards out of black phenol fiber because he felt that the phenol was more stable than ebony. He began making his own rosettes in 1969. He also constructed a banjo in that year.

The part of guitar construction that he enjoyed most was carving the neck, especially the heel. One of my fondest memories is of watching him as he worked on the mahogany to create a beautiful sculpture, which he would decorate with a beautifully finished, singing body.

In 1975 Fred began a series of experiments (which he would continue until his death) to make “various acoustic measurements on the guitar and its parts.” The object of the experiments was “to determine the response vs. frequency of the instrument and its various parts in an effort to set the various resonances at their ideal positions.” Using a special sound room which he built, he did experiments to: determine the effect of the height of the sides of a standard classical guitar on air resonance frequency; test different strutting patterns on the backs and tops of guitars including Cartesian, circular, lattice, traditional, and X bracing; study the effect of soundposts in guitars; chart the air modes of his and others’ guitars; study the relationship between the Helmholtz resonance and volume; and test a new bridge design using graphite-reinforced epoxy which he called his “magic bridge.”

In 1977 Fred attended the 9th International Conference on Acoustics in Madrid where he presented a paper, “Tuning the Eigenmodes of Free Violin and Guitar Plates by Chladni Patterns” with Carleen Hutchins. He wrote for the CAS Newsletter but refused to submit articles unless he was 100% certain of the data. He also gave lectures at local colleges in New Jersey.

In his lifetime Fred built ninety-four classical guitars, four steel string guitars, a flamenco guitar, a banjo, and a harpsichord soundboard. Trying to understand plate tuning in the guitar was his life’s goal.

— Pauline Dickens

Fred Dickens at the 1992 GAL Convention after attending the free plate tuning demonstration by Carleen Hutchins. Photo by Dale Blindheim.

Although an excellent craftsman, Fred viewed instrument making (or the making of anything else for that matter) as a vehicle to understanding the science and principles behind the result. He constantly strove to understand the physics, and the nature of materials and their interaction. The search was always more important than the product, although the guitar was most often the chosen teacher. As a result, Fred was the work in progress. Understanding the universe was his goal.

Fred had little tolerance for ignorance masquerading as knowledge. Half-baked theories were always exposed to the light of his more rigorous testing. I was very fortunate to make Fred’s acquaintance shortly after he and his wife moved to Virginia. Our mutual interest in instrument making and his willingness to teach some of those scientific principles I had neglected to consider contributed to a friendship now sorely missed. Fred’s gift was his willingness to patiently share what he had learned with those willing to listen. I only wish more makers would have had the opportunity to learn from
his experience and example.

— James Jones

When I began music acoustics research in 1970 I was intrigued by articles written by Fred T. Dickens, which combined an honest, homey style with advanced ideas on guitar behavior. I began writing to Fred, and in 1982 during a research tour of the USA, we stayed some days with Fred and Pauline. Their company was relaxing and humanizing after intense work and travel. We shared notions of guitars and violin physics, methods of working advanced instruments, the nature of those involved in such a rare field of endeavor, and the big questions: life, the universe, and everything. We ate and drank with Fred and Pauline and became friends.

Fred was an honest, practical man. His work at the Bell Laboratories was respected because of his integrity with results. He was meticulous in research and true with his friends. His marriage to Pauline was caring and creative, and their love for each other was unmistakable. I admire them both and wish Pauline comfort and peace in her loss of a wonderful husband.

— Graham Caldersmith

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Letter: Cleaning/Polishing of Violins

Letter: Cleaning/Polishing of Violins

by William T. Walls

Originally published in American Lutherie #12, 1987 and Big Red Book of American Lutherie Volume One, 2000



Dear Guild Members,

Reference is made to George Manno’s “Violin Q&A” regarding cleaning and polishing violins. I have been making, repairing, and restoring bowed instruments professionally for over fifty years and would like to offer my 2¢ worth.

I strongly recommend that xylene and similar products for cleaning caked-on rosin be used with extreme caution, as some varnishes will dissolve or become tacky when wet with them. Test them in a small place in an area that will not be noticed if the varnish is susceptible to damage. If it appears that xylene is safe, rubbing with a cloth may require a lot of rubbing, and a lot of rubbing may damage the varnish. I have found the following to be completely safe, effective, and fast for any instrument regardless of how bad the rosin build-up is.

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Letter: Settling-In of Guitars

Letter: Settling-In of Guitars

by Chris von der Borch

Originally published in American Lutherie #40, 1994



Dear Guild,

I have been constructing classic, baroque, and steel string guitars since around 1960. It is a long-term hobby of mine, as is guitar playing (in real life I am a professor of marine geology). I have made about sixteen instruments, with latter classicals being based precisely on measurements of several well-known Fleta guitars, including top thickness gradations and strut dimensions. I have used a variety of highest-quality soundboard wood (cedar, Sitka spruce, European spruce) and Brazilian rosewood. Recently I completed my first Smallman-style guitar using a wafer thin cedar soundboard (1MM) combined with web strutting of balsa and carbon fibre and a series of rather heavy internal braces to reinforce soundboard support.

Of all the above, only two are really satisfactory. One is a Sitka spruce Fleta-style guitar which matured after several years into a top instrument. The other success is the Smallman-style guitar, despite a slight fall off in “zippiness” from initial tune-up. Other guitars typically sounded brilliant, usually 24 hours after initial tune-up. This brilliance typically persisted for a couple of weeks, after which the tonal quality and sustain deadened somewhat and never returned. These guitars, on maturation, have become pleasant, run-of-the-mill instruments, but not world shakers! These observations imply, I feel, that the essential ingredients for superior tone were initially present, but a mechanical and not an acoustical problem has occurred. In short, stresses have set in, or the soundboards have lost some of their initial tension. I should add that up to now, all of my guitars have been constructed under careful humidity control and in such a way as to minimize any inbuilt stresses.

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