Monochord

A monochord is an ancient musical and scientific laboratory instrument. The word "monochord" comes from the Greek and means literally "one string." A misconception of the term lies within its name. Often a monochord has more than one string, most of the time two, one open string and a second string with a movable bridge. In a basic monochord, a single string is stretched over a sound box. The string is fixed at both ends while one or many movable bridges are manipulated to demonstrate mathematical relationships between sounds. With two strings you can easily demonstrate how a consonant just chord sounds. Both open strings are tuned equal and then the movable bridge is put in a mathematical position to demonstrate, for instance, the major third (at 4/5th of the string length) Play or the minor third (at 5/6th of the string length) Play.