Noah Webster
Echometer
ECHOM'ETER, noun [Gr. sound, and measure.] Among musicians, a scale or rule, with several lines thereon, serving to measure the duration of sounds, and to find their intervals and ratios.
ECHOM'ETER, noun [Gr. sound, and measure.] Among musicians, a scale or rule, with several lines thereon, serving to measure the duration of sounds, and to find their intervals and ratios.