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FIG.

LIST OF ILLUSTRATIONS.

1.-Vibrations of Stretched String.

2. Harmonic Sounds. Nodes and Ventral Segments of a Vibrating String .

3. Harmonics. Nodes and Ventral Segments of a Vibrating 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.

12. Vibrations of a Plate.

15.

16.

17.

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13. Nodal Lines of Vibrating Circular, or Polygonal Plates, according to Chladni and Savart.

14.--Nodes and Segments of a Vibrating Bell

Section of a Bell

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Proof of the Vibration of a Glass Bell,

Striking Reed

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18.--Free Reed

19.-Egyptian Flute

20.-Prismatic Sonorous Pipes

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FIG.

21.-Cylindrical Sonorous Pipes 22.-Trevelyan's Instrument.

23.

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Cause of Vibratory Movements. 24-Philosophical Lamp or Chemical Harmonicon .

25.-Kundt's Tube .

26.-Experimental Study of the Laws of Reflection of Sound 27.-Sonorous Refraction.

M. Sondhauss's Instrument

28.-Propagation of a Sonorous Wave through an Unlimited Medium

29.-M. Helmholtz's Resonance Globe

30.-Beats of Imperfect Unison. Ordinates of Ten Waves. 31.-Ordinates of Eleven Waves transmitted in the same

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time.

32. Sums of the Corresponding Ordinates

33.-Savart's Toothed Wheel

34.-Seebeck's Siren

35.-Cagniard de Latour's Siren .

36. Interior View of the Siren 37.-Helmholtz's Double Siren

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38.-Vibroscope.

39.-Combination of two Parallel Vibratory Movements. 40.-Vibrations of Compound Sounds . .

41.-Optical Study of Vibratory Movements

42.--Optical Curves representing the Rectangular Vibrations
of Two Tuning-forks in Unison

43.-Combination of Two Rectangular Vibratory Movements
44.-Optical Curves. The Octave, Fourth, and Fifth
45.-Open Tube, with Manometric Flame

46.-Apparatus for the Comparison of the Vibratory Move-
ments of Two Sonorous Tubes

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47. Manometric Flames. Fundamental Note, and the Octave
above the Fundamental Note.
48.-Manometric Flames simultaneously given by Two Tubes
at the Octave.

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