Posted on October 25, 2021May 14, 2025 by Dale Phillips Geometric Design of the Stradivari Model G Violin, Part One: Mold and Template Geometric Design of the Stradivari Model G Violin, Part One: Mold and Template by Robert J. Spear Originally published in American Lutherie #93, 2008 see also, Geometric Design of the Stradivari Model G Violin, Part Two: f-holes by Robert J. Spear Geometric Design of the Stradivari Model G Violin, Part Three: The Scroll by Robert J. Spear I have little doubt that artists, artisans, and architects of the Renaissance and Baroque used some system of guidance for their drawings that was based on the knowledge of geometry and the use of straightedge and divider. I began my drawing adventure almost five years ago by following the guidelines for the geometric design of the Model G in Sacconi’s book and soon discovered errors. Even so, I was convinced that it would be worthwhile to use a classical Cremonese approach based on geometry because I wanted to see if I could integrate it with Hutchins and Schelleng’s scaling theories used for the New Violin Family. While the acoustical aspects of the exercise are not germane here, I worked to realize a design system that would essentially produce a second generation of octet instruments close to a classical Cremonese violin in the style of the Model G Stradivari. My goal was to impart a greater uniformity to the octet family’s models, but to keep this article within bounds I have confined my remarks to the violin. There are those who question whether geometric design really played an important role in violin design and suggest that the model outline could be designed freehand. Others allow that some sort of geometrical or proportion scheme was used, but that it was not based on the golden section. A few ask why one can’t just get a good photo of a good model and enlarge or reduce it at the local copy center. You can (and I did at first), but because strange things start to happen in the larger and smaller instruments during the scaling process, straight scaling does not hold up. Still others, including Sacconi, stress that the eye was the final arbiter of any design, no matter how it was derived. I will attempt to address all of these points in this series of articles. Become A Member to Continue Reading This Article This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. If you are already a member, login for access or contact us to setup your account.
Posted on October 25, 2021May 14, 2025 by Dale Phillips Geometric Design of the Stradivari Model G Violin, Part Two: f-Holes Geometric Design of the Stradivari Model G Violin, Part Two: f-Holes with Robert J. Spear Originally published in American Lutherie #94, 2008 see also, Geometric Design of the Stradivari Model G Violin, Part One: Mold and Template by Robert J. Spear Geometric Design of the Stradivari Model G Violin, Part Three: The Scroll by Robert J. Spear The Cremonese design for the f-holes of a violin, at first glance, would appear to be based on the same design philosophy as the body and to make extensive use of the golden section. A. Thomas King, in his article “The Cremonese System for Positioning the f-Holes” in The Strad, shows rather convincingly that golden-section divisions based on the distance between the pins on the body was employed to fix the location of the f-hole eyes, which further reinforces this idea. However, when it comes to f-holes, I would like to suggest that there are a couple of additional jokers in the deck. First, the late Cremonese f-hole is derived from an earlier system of design, and some of the important parts of the predecessor system remain in use; second, an entirely different modulus is used for the f-holes than for the body; and, third, little is based on the golden section. The Forma G violin, upon which my model is based, is not quite the longest violin Stradivari ever made, but it is the widest. The most notable increase in width is in the center bout, which has another direct impact on the design of the f-hole and its placement. King notes that there is a general method for most Cremonese violins and a specialized adaptation for Stradivari violins. King explained the rather unintuitive step of taking the golden section of the distance between the locating pins in the top as the modulus for positioning the f-holes. I have used his approach here because it has many good points of correlation, and because I found an additional correlation that has convinced me even further that his hypothesis is correct. Become A Member to Continue Reading This Article This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. If you are already a member, login for access or contact us to setup your account.
Posted on January 14, 2010May 28, 2025 by Dale Phillips Review: Left-Brain Lutherie by David C. Hurd, PhD Review: Left-Brain Lutherie by David C. Hurd, PhD Reviewed by R.M. Mottola Originally published in American Lutherie #81, 2005 and Big Red Book of American Lutherie Volume Seven, 2015 Left-Brain Lutherie Using Physics and Engineering Concepts for Building Guitar Family Instruments: An Introductory Guide to Their Practical Application David C. Hurd, PhD ISBN 0-9760883-0-4 Ukuleles by Kawika, Inc. www.ukuleles.com A prepublication copy of David Hurd’s Left-Brain Lutherie was given to AL for review. A draft of the following review was sent to the author prior to publication so that any factual errors in the review could be corrected. During the early 1980s I worked at a small engineering company that made instrumentation used in biomedical research. As the company grew, the product line expanded to include devices used in other fields, including analytical chemistry and materials science. I count the time I spent on this job as some of the most precious in my life, in no small part because it provided the opportunity to spend a good deal of time with research scientists and to be directly involved in some of their efforts. This contact taught me the value of scientific methodological inquiry, and it shaped my consideration for the folks who do this work as some of the most creative and open-minded people to be found. That scientists are smart, careful, and highly analytical fits well with the general image of those in the field. But the fact that they approach their research subjects with high levels of openness, objectivity, and general creativity unfortunately somehow gets lost in the general stereotype of scientists. Become A Member to Continue Reading This Article This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. If you are already a member, login for access or contact us to setup your account.
Posted on January 5, 2010May 22, 2025 by Dale Phillips Review: Engineering the Guitar: Theory and Practice by Richard Mark French Review: Engineering the Guitar: Theory and Practice by Richard Mark French Reviewed by Bill Greenwood Originally published in American Lutherie #99, 2009 Engineering the Guitar: Theory and Practice Richard Mark French ISBN (hardback): 9780387743684 Springer, 266 pp. 2009 With Engineering the Guitar, the author introduces a new genre of musical acoustics textbook, aimed at a niche audience of mathematically literate students who are relatively new to the details of guitar structure and guitar building. The book assumes familiarity with basic physics and calculus that includes a modest background in differential equations and Fourier series, and presents some excellent applications of basic engineering analysis that will be appreciated by those who have taken a standard course in the strength of materials. The book parallels a unique course developed by the author at Purdue University, where a dozen engineering students all build identical classical guitars in the span of a single semester with the aid of computer-controlled machining. At the same time, the students are introduced to the basic physics of stringed instruments and to the engineering aspects of guitars. Although the target audience of college engineering students is rather narrow, the advanced level of the book and the refreshing examples generated by the author make it a useful and engaging reference for others who are interested in theory and measurements that relate to the structure and dynamic behavior of guitars. Become A Member to Continue Reading This Article This article is part of our premium web content offered to Guild members. To view this and other web articles, join the Guild of American Luthiers. Members also receive 4 annual issues of American Lutherie and get discounts on products. For details, visit the membership page. If you are already a member, login for access or contact us to setup your account.
