Originally published at the turn of the 20th century, this book clearly explains the nature of the organ pipe and the system of equal temperament, and how to set the equal temperament. The author also traces the evolution of the diatonic scale. He writes, "Modern Organ Tuning is carried out exclusively upon the principles of the system of Equal Termperament, since the old methods of the Mean Tone Temperament, and of the later Unequal Temperament, can only be occasionally found in benighted places, where life moves slowly . . ." 132 pages, softbound