tag="{http://www.w3.org/1999/xhtml}a">274

Chapter XII. Magnetic Effects Of Electric Currents, And Electrical Measurements.

• (1) The Magnetic Effect of Electric Currents 279
• (2) Electrical Measurements 289
• (3) Ohm's Law and Electrical Circuits 298
• (4) Grouping of Cells and Measuring Resistance 302

Chapter XIII. Chemical And Heat Effects Of Electric Currents.

• (1) The Chemical Effect of Electric Currents 307
• (2) The Storage Battery and Electric Power 312
• (3) The Heat Effect of Electric Currents 318

Chapter XIV. Induced Currents.

• (1) Electromagnetic Induction 326
• (2) The Dynamo and the Motor 335
• (3) The Induction Coil and the Transformer 343
• (4) The Telephone 349

Chapter XV. Sound.

• (1) Sound, Source, Speed, Media 354
• (2) Waves and Wave Motion 357
• (3) Intensity and Pitch of Sound 363
• (4) Musical Scales and Resonance 368
• (5) Interference, Beats, Vibration of Strings 374
• (6) Tone Quality, Vibrating Plates and Air Columns 384

Chapter XVI. Light.

• (1) Rectilinear Propagation of Light 388
• (2) Photometry and Law of Reflection 393
• (3) Mirrors and Formation of Images 400
• (4) Refraction of Light 410
• (5) The Formation of Images by Lenses 416
• (6) Optical Instruments 423
• (7) Color and Spectra 430
• (8) Nature of Light 442

Chapter XVII. Invisible Radiations.

• (1) Electric waves and Radioactivity 448

Chapter XVIII. Wireless Telephony And Alternating Currents.

• (1) Wireless Telephony 460
• (2) Alternating Currents 466
• Index 487

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PHYSICS

CHAPTER I

INTRODUCTION AND MEASUREMENT

(1) Introduction

1. Physics, an Explanation of Common Things.—Many students take up the study of physics expecting to see wonderful experiments with the "X" rays, wireless telegraphy, dynamos, and other interesting devices. Others are dreading to begin a study that to them seems strange and difficult, because they fear it deals with ideas and principles that are beyond their experience and hard to comprehend.

Each of these classes is surprised to