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.