During the nineteenth century a major change took place in musical-instrument making. In the course of industrialization many crafts transformed into industries, and production methods changed significantly. Prompted by this development, many trained piano makers, like Siegfried Hansing, published “educational books,” in hopes of establishing a fixed canon of explicit knowledge. This canon, elucidating physics and acoustics to an audience of craftsmen (and, to a lesser extent, lay theoreticians), was intended to replace the craftsmen’s working knowledge. Despite efforts to bring explicit knowledge to industrialized musical-instrument making, the working knowledge of the craftsmen remained irreplaceable.