John R. Waddle Violins Inc.Map & DirectionsBiographyPhilosophy and ServicesInstruments and bows currently availablePublished ArticlesLinksThe Betts ProjectContactTo Dampit article

CT Scans and Computed Tomograpy

John Waddle and radiologist Steven A. Sirr MD have developed a unique expertise in using computed tomography — CT Scans — to visualize valuable bowed string instruments. The project began when Dr. Sirr brought his violin to work with him and, out of curiosity, ran it through a CT scanner.

Since then, he and John have obtained permission to scan many of the world's great violins and published their findings in scientific journals. As they have concluded:

  • CT can provide the modern luthier and acoustic scientist with a unique tool for noninvasive evaluation of an instrument's structure, defects, and repair history and for accurate measurements of its wood thickness and density.


  • CT derived information may aid luthiers in replicating the qualities of original masterpieces.


  • CT evaluation may have an important role in the valuation, insurance, and identification of valuable stringed instruments.

The Progress of Progress- pdf

"The Progress of Progress" is an article I wrote with Steve Sirr and Steve Rossow about the Betts Stradivari violin of 1704.  If you click on the title, you should be able to download the pdf of the article.

Strad article-ice age

This is an article, written by Steven Sirr, Steve Rossow, and I about the wood used by the Cremonese master violin makers. 

To Dampit or Not to Dampit

An article I wrote for the ASTA journal here in Minnesota.

powered by AccelSite Content Management System | customized by Dakota Street Design