PITCH-ITS MEASUREMENT, LIMITS, VARIATION, STANDARDS,

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LIST OF ILLUSTRATIONS.

FIG.

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

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9.-Zanze

10.-Marimba

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11.-A Tuning-fork mounted on a Sounding-box.

12.-Vibrations of a Plate.

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

14.-Nodes and Segments of a Vibrating Bell

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15.-Section of a Bell . . .

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16.-Proof of the Vibration of a Glass Bell

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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

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

38.-Vibroscope.

39.-Combination of two Parallel Vibratory Movements.

40.-Vibrations of Compound Sounds .

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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

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

47.-Manometric Flames. Fundamental Note, and the Octave above the Fundamental Note .

48.-Manometric Flames simultaneously given by Two Tubes at the Octave.