A technical manual presenting both theory and practical methods for piano design, construction, and tuning. It surveys the instrument's development and provides detailed descriptions of modern piano components, acoustical principles, scale and temperament, string specifications, resonance systems, casing and framing, the iron plate, and the hammer-and-action mechanisms. It also covers regulation and touch adjustment, tuning and tone regulation, scale draughting, and concludes with appendices on player mechanisms and small-grand design considerations.