Sound / by John Tyndall.

John Tyndall

Date:: 1875

Credit: Sound / by John Tyndall. Source: Wellcome Collection.

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$CONTENTS. CHAPTER I. PAGE The Nerves and Sensation—Production and Propagation of Sonorous Motion—Experiments on Sounding Bodies placed in Vacuo—Dead- ening of Sound by Hydrogen—Action of Hydrogen on the Voice— Propagation of Sound through Air of varying Density—Reflection of Sound—Echoes—Refraction of Sound—Diffraction of Sound; Case of Erith Village and Church—Influence of Temperature on Velocity —Influence of Density and Elasticity—Newton’s Calculation of Ve- locity—Thermal Changes produced by the Sonorous Wave—Laplace’s Correction of Newton’s Formula—Ratio of Specific Heats at Constant Pressure and at Constant Volume deduced from Velocities of Sound —Mechanical Equivalent of Heat deduced from this Ratio—Inference that Atmospheric Air possesses no sensible power to radiate Heat— Velocity of Sound in different Gases—Velocity in Liquids and Solids —Influence of Molecular Structure on the Velocity of Sound . . 1 Summary of Chapter 1 43 CHAPTER II. Physical Distinction between Noise and Music—A Musical Tone pro- duced by Periodic, Noise produced by Unperiodic, Impulses—Pro- duction of Musical Sounds by Taps—Production of Musical Sounds by Puffs—Definition of Pitch in Music—Vibrations of a Tuning- fork ; their Graphic Representation on Smoked Glass—Optical Ex- pression of the Vibrations of a Tuning-fork; Description of the Syren—Limits of the Ear; highest and deepest Tones—Rapidity of Vibration Determined by the Syren—Determination of the Lengths of Sonorous Waves—Wave-lengths of the Voice in Man and Woman —Transmission of Musical Sounds through Liquids and Solids. . 47 Summary of Chapter II. 80 CHAPTER III. Vibration of Strings—How employed in Music—Influence of Sound- Boards—Laws of Vibrating Strings—Combination of Direct and Reflected Pulses—Stationary and Progressive Waves—Nodes and$

Sound / by John Tyndall.

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