Appetite however was gone, all seemed amazed to sit down to dinner at such an unusual hour; the jaws had not that Isochronous measure which announces a regular business.
"The Physiology of Taste"
Brillat Savarin
A speaking tone, on the contrary, is produced by vibrations which are not Isochronous; it is not a note, properly so called, and can not be prolonged, without varying in pitch.
"The Ontario Readers: The High School Reader, 1886"
Ministry of Education
Foster, Isochronous Oscillations in a resisting medium, Observations on a strange piece of Iceland Spar.
"Autobiography of Sir George Biddell Airy"
George Biddell Airy