A team of experts has created a reproduction of a 1704 Stradivarius violin, using computed tomography imaging and advanced manufacturing techniques.
“Computed tomography (CT) scanning offers a unique method of noninvasively imaging a historical object,” said Steven Sirr from FirstLight Medical Systems, USA. “Combined with computer-aided machinery, it also offers us the opportunity to create a reproduction with a high degree of accuracy.”
To create a violin with the same characteristics as the 1704 instrument known as “Betts”, Dr. Sirr worked with professional violin makers John Waddle and Steve Rossow of St. Paul, USA.
“We have two goals: to understand how the violin works and to make reproductions of the world’s most prized violins available for young musicians who can’t afford an original,” Dr. Sirr said.
The original violin was scanned with a 64-detector CT, and more than 1,000 images were converted into stereolithographic files, which can be read by a computer-controlled router called a CNC machine. The machine, custom-made for the project by Rossow, then carved the back and front plates and scroll of the violin from various woods. Finally, Waddle and Rossow finished, assembled and varnished the replica by hand.
“We believe this process of recreating old and valuable stringed instruments may have a profound influence upon modern string musicians,” Dr. Sirr said.
Of the Stradivarius and other prized violins still in existence, many are housed in museums and are never played. Others are sold for millions of dollars to top professional musicians. The Betts Stradivarius is held in the U.S. Library of Congress.
Dr. Sirr, an amateur violinist, first scanned a violin with CT out of curiosity. “I assumed the instrument was merely a wooden shell surrounding air,” he said. “I was totally wrong. There was a lot of anatomy inside the violin.”
After he shared those first CT images with Waddle in 1989, the two spent years scanning more than 100 violins, including 29 valuable instruments pre-dating 1827, and other stringed instruments to better understand their composition.
“Just like human beings, there is a wide range of normal variation among violins,” Dr. Sirr said. “When you are looking at an instrument that is hundreds of years old, you will see worm holes and cracks that have been repaired, as well as damage from being exposed to all kinds of conditions, from floods to wars.”
“CT is useful in measuring wood density, size and shapes, thickness graduation and volume measurements,” Dr. Sirr said. “It also provides detailed analysis of damage and repair.”