FIG. LIST OF ILLUSTRATIONS. PAGE 7 8 1.-Vibrations of Stretched String. 2.-Harmonic Sounds. Nodes and Ventral Segments of a Vibrating String 3.-Harmonics. Nodes and Ventral Segments of a Vi brating String 4.-Sonometer 5.-Longitudinal Vibrations of Rods. 6.-Marloye's Harp 7.-Vibrations of a Metal Rod. 8.-Nail Fiddle. 9.-Zanze 10.-Marimba 11.-A Tuning-fork mounted on a Sounding-box. 13. Nodal Lines of Vibrating Circular, or Polygonal Plates, according to Chladni and Savart. 14.-Nodes and Segments of a Vibrating Bel! 15.-Section of a Bell .. 16.-Proof of the Vibration of a Glass Bell 12 16 17 18 19 20 21 23 25 26 28 32 33 35 35 37 38 Medium 30.-Beats of Imperfect Unison. time. 32. Sums of the Corresponding Ordinates 33.-Savart's Toothed Wheel 21-Philosophical Lamp or Chemical Harmonicon. 26.-Experimental Study of the Laws of Reflection of Sound 27.-Sonorous Refraction. 28.-Propagation of a Sonorous Wave through an Unlimited 29.-M. Helmholtz's Resonance Globe 31.-Ordinates of Eleven Waves transmitted in the same 43 56 57 M. Sondhauss's Instrument. . 58 63 66 71 73 78 42.-Optical Curves representing the Rectangular Vibrations 43.- Combination of Two Rectangular Vibratory Movements 46.-Apparatus for the Comparison of the Vibratory Move- 47.-Manometric Flames. Fundamental Note, and the Octave above the Fundamental Note. 96 48.-Manometric Flames simultaneously given by Two Tubes at the Octave. 97 |