r Pneumatics--Division
of Organs--Sound Reflection--Octave Couplers and Extensions

CHAPTER V

Stop-keys--Control of the Stops

CHAPTER VI

Radiating and Concave Pedal Boards--Pedal-stop Control--Suitable Bass
Attachments

CHAPTER VII

Means of Obtaining Expression--Crescendo Pedal--Sforzando Pedal--Double
Touch--Balanced Swell Pedal--Control of Swell by Keys--Swell Boxes--the
Sound Trap Joint--Vacuum Swell Shutters

CHAPTER VIII

A Revolution in Wind Supply--Springs vs. Weights--Individual
Pallets--Heavy Wind Pressures--Mechanical Blowers

CHAPTER IX

Transference of Stops--Double Touch--Pizzicato Touch--the Unit
Organ--Sympathy

CHAPTER X

Production of Organ Tone--Acoustics of Organ Pipes--Estey Open Bass
Pipes--Diapasons--Flutes--Strings--Reeds--Vowel Cavities--Undulating
Stops (Celestes)--Percussion Stops--the Diaphone

CHAPTER XI

Tuning--Equal Temperament--New Method of Tuning Reeds

CHAPTER XII

Progress of the Revolution in Our Own Country

CHAPTER XIII

Chief Actors--Barker--Cavaille-Coll--Willis--Hope-Jones

CHAPTER XIV

How We Stand To-day--Automatic Players--Specifications of Notable
Organs: St. George's Hall, Liverpool; Notre Dame, Paris; St. Paul's
Cathedral, London; Westminster Abbey; Balruddery, Scotland; Worcester
Cathedral; Yale University, U. S. A.; St. Paul's Cathedral, Buffalo;
Paris Theatre, Denver; Cathedral of St. John the Divine, New York;
University of Toronto, Canada; City Hall, Portland, Me.; Liverpool
Cathedral, England

INDEX TO ILLUSTRATIONS

The Organ in St. George's Hall, Liverpool, Eng. . . . _Frontispiece_
Prehistoric Double Flutes
The Wind-chest; Front View. The Wind-chest; Side View.
The Pneumatic Lever
Nomenclature of Organ Keyboard
Portrait of Moitessier
Tubular Pneumatic Action
The First Electric Organ Ever Built
The Electro-Pneumatic Lever
Valve and Valve Seat, Hope-Jones Electric Action
Portrait of Dr. Peschard
Console, St. Paul's Cathedral, Buffalo
Console on Bennett System
Console, Trinity Church, Boston
Console, College of City of New York
Principle of the Sound Trap
Sound Trap Joint
The Vacuum Shutter
Series of Harmonics
Estey's Open Bass Pipes
Diapason Pipe with Leathered Lip
Haskell's Clarinet without Reed
Diagram of Reed Pipe
Vowel Cavities
Diaphone in Worcester Cathedral
Diaphone in Aberdeen University
Diaphone in St. Patrick's, N. Y.
Di