Kathleen Schlesinger, 1911 Encyclopædia Britannica, Volume 6… (1911)
“ In a unique specimen with two keyboards dating from the 16th or 17th century, which is in the collection of Baron Alexandre Kraus, [3] what appear to be vibrating strings stretched over a soundboard perpendicular to the keyboard are in reality the wires forming part of the mechanism of the action. The arrangement of this mechanism is the distinctive feature of the clavicytherium, for the wires, unlike the strings of the upright spinet, increase in length from left to right, so that the upright harp-shaped back has its higher side over the treble of the keyboard instead of over the bass. ”
