Posted on June 23, 2025January 20, 2026 by Dale Phillips Review: Acoustic Guitar Design by Richard Mark French Review: Acoustic Guitar Design by Richard Mark French reviewed by R.M. Mottola Originally published in American Lutherie #154, 2025 Acoustic Guitar Design Richard Mark French ISBN 978-3-030-89380-4 Springer Hardcover, color interior, 347 pp. $35.97 Reviewer’s Note: A copy of the book reviewed in the following paragraphs was provided to American Lutherie for review. The […] This post is only available to members.
Posted on June 23, 2025January 20, 2026 by Dale Phillips Letter: Passing of Mary Jo Derby Letters and more from our readers Originally published in American Lutherie #154, 2025 Dear Guild Members, Shortly before this issue went to press, I got the sad news that Mary Jo Derby, a longtime employee at Gibson, had passed away. I met Mary Jo at the Gibson Custom Shop, where she was part of the small […] This post is only available to members.
Posted on June 21, 2025September 15, 2025 by Dale Phillips The Helmholtz Resonance The Helmholtz Resonance A Brief and Not-Too-Technical Introduction to the History and Theory of the Lowest Sound-Producing Mode, and Some Practical Considerations for Instrument Designers by R.M. Mottola Originally published in American Lutherie #82, 2005 and Big Red Book of American Lutherie Volume Seven, 2015 Research in physics and acoustics of stringed instruments shows us the mechanism by which sound is produced by those instruments. The plates of the instruments and the air inside vibrate in various patterns, each pattern producing sound in a range around a certain frequency. Each of these patterns can be considered to be a resonator, each with its own characteristics. Some of these resonators exist as modes of vibration of different areas of the plates of an instrument, and some are modes of vibration of the air inside the instrument. One of the air resonators is composed of the mass of air inside the instrument and the mass of air within and around the soundhole. The natural frequency of this resonator is near the lowest note that an instrument can make. It is generally labeled the A0 resonance, the letter A standing for the word “air” and the numeral 0 indicating that this is the first in a series of air resonances. This resonance is also referred to as the so-called Helmholtz resonance. Understanding how this resonance works in stringed instruments is not difficult, particularly given a historical perspective. Complete understanding involves some math, but a practical understanding can be had without it. Therefore, I am putting off presenting the formulae in the main article and have included them in a sidebar. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
Posted on June 21, 2025September 15, 2025 by Dale Phillips The Helmholtz Formula The Helmholtz Formula by R.M. Mottola Originally published in American Lutherie #82, 2005 and Big Red Book of American Lutherie Volume Seven, 2015 The resonant frequency of a mass spring resonator can be determined by the following formula: Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.
Posted on June 19, 2025September 12, 2025 by Dale Phillips Working with Water-based Finish Working with Water-based Finish by John Kitakis Originally published in American Lutherie #68, 2001 and Big Red Book of American Lutherie Volume Six, 2013 The protective and decorative coating of stringed instruments we call finish work seems to be a never-ending struggle. The battle to produce a beautiful finish and the mental anguish it induces, along with trying to stay healthy while complying with environmental laws makes finish work a challenge, to say the least. Some of us live in areas with strict industrial emissions codes, whereas others live where no one cares. But even in these “country” settings, the fact remains that certain finishing materials are hazardous, both to our bodies and the environment. And since most luthiers love wood, trees, clean air, music, food, children — you know, all of the good things in life — then we should strive to build and finish in a conscientious manner. In the 1970s I began building and restoring furniture, and then eventually stringed instruments. During those years I experimented with oils, varnish, French polishing shellacs, and synthetic lacquers, and still have pieces of furniture in my house twenty-five years later that have beautiful, hand-rubbed finishes. But to be productive (read “to make a profitable living”) I chose nitrocellulose lacquer. And through those years I must have sprayed enough lacquer and polyurethanes (toluene, benzene, xylene, and more) to probably kill all of the laboratory rats in the world. I’m probably alive thanks to my exhaust fan (who knows what happened to the neighbors?), but each night I would have headaches and a crusty irritation in my nose and lungs, along with having to clear my throat every few seconds. My wife could actually smell the fumes exuding from me as we slept. So those who use these nasty chemicals — with or without the benefit of fans and masks — besides dying young, become grumpy, irritable, and perhaps even unwilling sponsors of the drug companies. Become A Member to Continue Reading This Article This article is part of the Articles Online featured on our website for Guild members. To view this and other web articles, join the Guild of American Luthiers. For details, visit the membership page. MEMBERS: login for access or contact us to setup your account.