Harmonicon

Harmonicon, a musical instrument consisting of glass or metal plates supported on strings at points about one-fourth of the length from the free ends. The plates are struck by soft hammers and enter into transversal vibrations, the frequency of which varies directly as the thickness, inversely as the square of the length, directly as the square root of the elasticity of the vibrating material, and inversely as the square root of its density. The points of support become nodal points.