CAS Journal
November 1996
Volume 3, No. 2 (Series II)

From the Editor ...

Among the highlights of the CAS/MVA conference last April were some extraordinary X-ray images of violins and cellos. To me, these were far more exciting than the first pictures of the far side of the moon. After all, the far side was not all that different from the side we always see. But I had never seen cross-sectional slices of a Strad, a perfect garland with sound post in place, exact graduations, and the like. I am pleased that this issue includes Waddle and Sirr's paper, with some of their remarkable images, for all the membership to see. I encourage you to refer to the Waddle-Sirr cross-section of the Montagnana cello, showing the asymmetrical graduation pattern, when you read the Schleske paper on making "tonal copies." It is an unusual example of publishing serendipity, as Waddle and Sirr neatly illustrate Schleske's point about asymmetrical graduation. This issue and the next will carry many of the papers from the CAS/MVA conference.

Other "firsts" in this issue include Schleske's study of eigenmode changes during violin-making, a continuation of his paper in the previous issue. He demonstrates for the first time the principles and possibilities for making "tonal copies." Schumacher and Garoff's paper presents the first observations that directly show permanent physical consequences to the bowing device of the slip-stick bowed-string motion at the point of contact between bow and string.

The perennial "viola problem" is represented in this issue by two papers. Miles explains how it is possible to make the viola longer inside than outside, thereby altering the air modes. Purich explains how some changes to the usual outline and to construction materials can be beneficial.

I am delighted that Gregg Alf offered to share the design for the Curtin & Alf bassbar frame. Simple in concept, and not difficult to make, the frame helps in the fitting process by ensuring that the bar will be positioned consistently in all three orientations. i hope that more makers will offer to share the tools, jigs, methods, and construction objectives they have found useful for producing acoustically and aesthetically superior instruments.

We have continued to make minor changes to the Journal format. Our goal is to provide a more appealing and readable journal, and we hope you like it. We would appreciate your comments and suggestions for what we can still do better.

Good Reading!

A. Thomas King

Table of Contents

3 - X-ray Computerized Transaxial Tomographic Analysis of Stringed Instruments by John Waddle & Steven Sirr

9 - Bowing with a Glass Bow by R. T. Schumacher & S. Garoff

18 - On Making "Tonal Copies" of a Violin by Martin Schleske

29 - Tuning the A1 Mode Without Changing the Body Size of an Instrument by John L. Miles

Violinmaker's Forum

36 - Plate Margins: the Next Frontier by William Atwood

40 - The Setup and Repair of the Bass Violin for Optimum Sound by Charles Traeger

45 - A Note on Tonewood Selection by Thomas M. Cox

47 - A New Look at Viola Design and Acoustics by Peter Purich

51 - Curtin & Alf's Bass Bar Frame by Gregg T. Alf

News and Correspondence

54 -

Recent Publications

55 -


56 -

In Memoriam

59 -

Letters to the Editor

60 -

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