Talk:Challis

Please identify this Challis

Margenau, in his introduction to the Dover edition of On the Sensations of Tone, states:

"Helmhotz' interest in acoustics was aroused for the first time in 1852, apparently by mathematical errors in the publications of Challis, which he corrected."

There is no entry for "Challis" in my 1922 Grove's Dictionary of Music and Musicians nor in the index of Benade's Fundamentals of Musical Acoustics. The only Challis in Wikipedia in James Challis. Is it he? Cutler 22:58, July 28, 2005 (UTC)