I don’t want to downplay genuine discovery, but your story about optically reading old records left me a little underwhelmed. The optical playing of records has been available in the commercial market for several years. Just do an Internet search for “laser turntables.”

Jerry Boehm
Schenectady, N.Y.

This is not an especially new invention. A commercial laser model capable of playing vinyl records (all sizes and speeds) in high fidelity has been available for at least the past 13 years. I suspect that the laser system is even more adaptable to measuring vertical trajectories in wax cylinders than a confocal microscope is.

Neil Goodell
Las Cruces, N.M.

Unlike laser turntables, the groove-mapping technique described in the story yields a copy of all the topographical information in the original recording’s grooves. Once preserved, those contours remain available as new and better methods of sound extraction are developed. Moreover, by graphical means, a restorer can lift scratches and other damage from the virtual surface .—P. Weiss The article reminded me of an idea from an old friend: It might be possible to re-create sounds of the distant past from pottery that was turned on a wheel. The ambient sounds (e.g., discussions between potter and client or apprentice) may have been recorded on the surface of the pot as it turned, particularly if the potter used a sharp metal tool in a last operation to smooth the surface. It might be worth a listen.

Ward Halverson
Cambridge, Mass.

In the close-up from the Cassini spacecraft [in “Titanic Images, Groovy Shots: Cassini arrives at Saturn,” SN: 7/10/04, p. 22: Titanic Images, Groovy Shots: Cassini arrives at Saturn ], some of Saturn’s rings look rather like grooves in a phonograph record. I wonder if anyone has tried mapping those grooves to see if they can be played using the method described in this article. Obviously, some artistic license would need to be taken, but what a challenge to create true music of the spheres.

RuthAnn Nichols
Champaign, Ill

From the Nature Index

Paid Content