The Octave Monochord is stringed two-sided, on one side with 20 overtone strings in c and 4 Tanpura strings (C, c, c, G)
Monochord with 30 overtone strings is 26 c‘ + 2 c + 2 g strings.
Monochord with 22 overtone strings + 6 A + 6 strings
Monochord with 19 overtone tuned
The Pythagorean Monochord is suited to play pure overtone spheres and can be used to demonstrate principles of mathematics and harmonics by inserting bridges. Its is stringed single-sided with 25 blanc + 5 bass strings, tuning c / C.