Chapter I. — The Elementary Indicator; a simple description of the principles involved I Chapter II. — The Value of Indicating a Compressor 11 Chapter III. — The Adiabatic Curve 19 Chapter IV — The Isothermal Curve Chapter V. — Discussion of the Adiabatic and iso thermal Curves. Chapter VI. — Finding the Horse Power of an Indi cator Card 37 Chapter VIL — Actual Displacement Of a Compressor 39 Chapter VIII. — Specia1 Faults as Shown by Cards. Chapter ix.-wet Compressor System Indicating. 51.