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  1. Sounds and Sound-Waves¡¡¡¡¡¡¡¡Âè1¾Ï¤ÎÀâÌÀ¤Ø
        Sound Waves
        Wave Front
        Velocity, Wave-length, Frequency, Amplitude
        Simple and Complex Waves; Phase
        Analysis of Sounds
        Musical Sounds
        Transients
        Sensitivity of the Ear
        Requirements for Perfect Reproduction
        Permissible Errors in Reproduction

  2. Record and Recording Systems ¡¡¡¡Âè2¾Ï¤ÎÀâÌÀ¤Ø

        Production of Mechanical Vibrations
        Early Recording ystems
        Ideal Respoonse to Sound
        Resonance and Damping
        Electriccal Recording
        Electrical and Mechanical Analogies
        The Electromagnetic Recorder
        Lateral-cut and Hill-and-Dale Records
        Appendix.-Note on Electrical Circuits

  3. Reproducing Systems¡¡¡¡¡¡¡¡Âè3¾Ï¤ÎÀâÌÀ¤Ø
        Historical Summary
        The Scientific Stage
        Even Response
        Limitations of Mechanical Reproduction
        Electrical Reproduction
        Advantage of Electrical Reproduction

  4. Sound-Boxes¡¡¡¡¡¡¡¡Âè4¾Ï¤ÎÀâÌÀ¤Ø
        Essential Features
        Motion of a Diaphragm
        The Air-chamber
        Action of the Stylus-bar
        The Electrical Analogy
        Stylus-bar Mountings
        Back-plate and Gaskets
        Miscellaneous Attachments
        Appendix.-Ecample of Sound-box Design

  5. Horns¡¡¡¡¡¡¡¡Âè5¾Ï¤ÎÀâÌÀ¤Ø
        Function of the Horn
        Properties required of a Horn
        Contour of a Horn
        The Exponential or Logarithmic Horn
        Another Approximation
        Size of Mouth Opening
        Non-circular Section
        Folded Horns
        Bifurcated Horns
        Material of Horns

  6. Tone-Arms¡¡¡¡¡¡¡¡Âè6¾Ï¤ÎÀâÌÀ¤Ø
        Record Groove Characteristics
        Geometrical Requirements
        Acoustical Requirements
        Mechanical Considerations
        Tone-arm Material
        Carrying-arms for Electric Pick-ups

  7. Record Wear, Needles, Surface Noises¡¡¡¡¡¡¡¡Âè7¾Ï¤ÎÀâÌÀ¤Ø
        Frictional Wear
        Reactive Wear
        Needles
        Surface-noise

  8. Electric Pick-Ups¡¡¡¡¡¡Âè8¾Ï¤ÎÀâÌÀ¤Ø
        Functions
        Types
        Velocity and Displacement Devices
        Electromagnetic Pick-ups
        Half-Rocker Moving-Iron Pick-ups
        Other Types
        Possible Developments
        Appendix.-Force Equations of the Half-rocker Pick-up

  9. Loud-Speakers¡¡¡¡¡¡¡¡Âè9¾Ï¤ÎÀâÌÀ¤Ø
        General Principles
        Reed-driven Mechanisms
        Moving-coil Mechanisms
        Diaphragm Effects
        Large Diaphragms
        The Outlook

10. Electric Amplifiers¡¡¡¡¡¡¡¡Âè10¾Ï¤ÎÀâÌÀ¤Ø
        Thermionic Valves
        Valve Characteristics
        Intervalve Couplings
        The Output Stage
        Special Conditions for Reception of Broadcasting
        Low-Frequency Amplifier Design
        Volume Controls
        Mains Units or Battery Elimiators
        Appendix.-Design of Amplifier Units

11. Miscellaneous Hints¡¡¡¡¡¡¡¡Âè11¾Ï¤ÎÀâÌÀ¤Ø
        Practical Considerations
        Motors
        Parts of a Spring Motor
        Care of the Motor
        Electric Motors
        Speed Regulation
        Levelling the Gramophone
        Record Faults
        Record Strage and Indexing



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